What is the cause of Photinia's light green leaves?
by Antonino Crapanzano
In this new article we talk about the Photinia.
If you want to make a beautiful hedge using the Photinia read this article.
We describe what are the main features of the Photinia, how to plant it, its cultivation, how and when to irrigate, the pruning operations and why the plants could have the light green leaves.
Enjoy the reading!
Characteristics of the Photinia and its light green leaves
Photinia is an evergreen shrub native to Asia, it is now widespread in many European and Mediterranean countries. It belongs to the family of Rosaceae.
It can reach a height of 5 meters or more and its diameter is around 5 meters. There are also dwarf varieties. The plant has a shrubby, erect and compact appearance and its branches are quite thick.
THE flowers of the Photinia they are grouped in inflorescences called corn on the cob. They are quite small and consist of five white or pink petals. They bloom mainly during the spring season.
The leaves of this shrub are lanceolate and leathery. The most important feature of this plant is the alternation of the color of their leaves, in fact, in spring they change from a dark green color to a bright red color which makes the plant very decorative.
At the end of the spring / summer period the leaves gradually turn green again.
If the winter season is not too cold, the Photiniait is able to emit new vegetation for almost the whole year, especially in the younger and apical parts.
Photinia fits very well to the climate of Mediterranean countries characterized by sunny places and tolerates moderate shading. In winter it is necessary to place it in places sheltered from cold and dry winds. The ground ideal for its development will have to be well drained and of average fertility.
In the open field, from young seedlings of about one year, we can obtain plants that reach 2 meters in height already in the second year of cultivation. In the fourth or fifth year they can reach their maximum development, reaching heights between 4 and 5 meters.
Photinia It's frost resistant, being able to withstand temperatures down to -5 ° C.
Plant the Photinia
The ideal period for plant the Photinia is the autumn one. The plant will spread its roots evenly, will grow healthy and lush from the first growing season.
If we buy the seedlings in containers we can plant them even during the spring and summer season. In this case we must take care to guarantee the young seedlings one regular watering especially in the first months of their life.
Cultivation of the Photinia
There Photiniait is a free-range plant and does not require special care.
The fertilizations carried out with organic fertilizer or based on nitrogen slow release contribute to thicken our plants of Photinia and to give them the energy they need to grow and develop.
The implantation sixth more appropriate provides a distance of 35-70 cm between the plants, based on the size of the plant itself and the hedge we want to create.
There Photiniait is a strong shrub because it adapts well to any temperature and is rarely weakened by pest attacks. It's a lot resistant to pollution, contributes to the protection of the environment and for this reason we can easily find it in urban areas.
There growth of this shrub is compact is vigorous, enough to be able to develop in a short time a green wall high enough that it will form a real natural wall that will have a shading effect.
The irrigation of the Photinia
During the first few years, if the Photiniais cultivated in the field, must be watered regularly in the months from March to October. Subsequently, rainwater will be sufficient and emergency irrigation will have to be carried out in case of drought.
If the Photinia is cultivated then vase it needs to be followed with irrigation and fertilization at least twice a year.
Pruning of the Photinia
There Photinia it can take on an untidy and aesthetically unpleasant appearance.
For this reason we can perform a pruning which will allow to give it a neat appearance and to make our plants of Photinia more pleasant by controlling their growth.
Recently planted seedlings do not necessarily need to be pruned. We can let the dwarfing cultivars grow naturally.
There pruning of the Photinia it is performed in two cases:
- when the young seedlings have reached a height of at least 30 centimeters;
- when the lateral and basal branches show excessive growth.
As we know, the operations of pruning we have to do it for thicken there Photinia and encourage the emission of new shoots, to give them a well-defined shape and limit the vegetative vigor.
THE ideal periods for prune the Photinia they are spring and summer.
It may be necessary to carry out some interventions even during the winter.
Let's proceed in order:
- pruning in March it is performed only on young plants to define their shape and bearing. We proceed by cutting the branches even 7 centimeters from the base of the plant. Photinia it will grow very quickly until it reaches and exceeds 30 centimeters in height in a short time;
- pruning in early summer it is performed on adult plants after flowering for thicken there Photinia, this intervention, in fact, is necessary to favor the emission of new autumn shoots. If the growth is excessive, we can intervene in winter by cutting only a few branches as we risk eliminating the flowers and causing only the leaves to be released.
The one performed on the Photinia it is mainly one training pruning necessary to give it a more orderly and pleasant shape. We proceed by eliminating the shortest branches in the highest position of the plant, at the base we cut those that do not have symmetry with the side branches and those placed at the top.
It is advisable to carry out the pruning operations during the early hours of the morning. The insider is free to choose which shape he wants to give to the plant.
Why the Photinia can it have light green leaves?
The reasons can be different but often this is due to nutritional deficiencies, or the lack of one or more fundamental elements, for example nitrogen or magnesium, for the growth and development of the plant.
The lack of one element rather than another manifests itself on the leaves by altering their coloring.
We focus our attention on the shortcomings they bring leaves of Photinia to take on a color light green:
- there nitrogen deficiency causes the development of light green leaves who tend to take a yellow color on the tips. If we notice this type of coloring on the leaves ours Photinia it will be necessary to replenish the missing nitrogen in the soil by means of cultivation of legumes, nitrogen fixing plants.
- there calcium deficiency on ours Photinia it is more noticeable on new leaves pale green in color, they also tend to curl up. We can remedy the calcium deficiency by fertilizing the soil with eggshell, a practice allowed in biological agriculture;
- there iron deficiency has greater relevance on young leaves of the Photinia that fade into color verde clear until they become yellow or even white;
- there magnesium deficiency manifests itself on the leaves already developed and concerns both the leaf and the veins. Magnesium deficiency leads to leaves to take on a color light green and in the most serious cases they may detach and fall from the tree prematurely;
- there sulfur deficiency causes discoloration of the leaves of the Photinia that become light green and a yellowing towards the tips; the development of the whole plant could be slowed down. Be careful not to confuse sulfur deficiency with nitrogen deficiency as they manifest themselves with rather similar symptoms for both.
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Mini_Guide on which wood to use to have a perfect hedge
If you too have just built your house and you need a perfect hedge then you should take a look at this article, if instead it is I who designed your house it is useless to read it I will have already told you about the ideal essence for your hedge perfect.
To choose the ideal plants for garden hedges, you first need to be clear about the function they are going to perform. If, for example, you need to shelter from strong winds or you want nothing or no one to peek into your property, then you will choose plants for hedges tall and dense garden plants, reaching heights of 15-20 meters. If, on the other hand, you want to define the boundaries of a certain space, such as an entrance path, a parking lot or a playground, then you can opt for lower and wider garden hedges.
If, for example, you have a fence or a wall that you want to cover, then the ideal thing is to choose climbing and vertically growing garden hedge plants, while if you are interested in your hedge also having a defensive function, you can opt for plants. for garden hedges with thorns or with tormenting leaves (that is, with hairs) capable of capturing fine dust.
Of fundamental importance when planting plants for garden hedges is also the preparation of the soil, which must be properly fertilized with organic compost and irrigated with a good irrigation system. During the first years of planting it will then be necessary to ensure regular weeding with natural fertilizers, in order to benefit the growth of the plants.
Here are the main characteristics of the 10 ideal plants for garden hedges :
- The Cherry Laurel
It's a evergreen garden hedge plant with fast growth up to 7 meters high and able to create a covering hedge, very florid and extremely compact. It is a very hardy plant as well easy to grow , tolerates the cold and parasite attacks well and does not require specific care. Its leaves have a splendid bright green color and an elongated, ovoid shape. It blooms in April with beautiful white flowers, followed by small black fruits, you will surely have seen it from some of your neighbors or friends because it is very widespread.
Be careful though because this plant contains a large concentration of citric acid, especially in the foliage, and it is toxic for humans and animals.
- Leylandii cypress
It is the ideal choice for those who want to raise a real one green wall that completely prevents the view from the outside into the garden and vice versa. This plant is one conifer among my favorites and is a hybrid between the Cupressus and the Chamaecyparis with a fine and soft vegetative mass, which resists cold and disease more than the variety of Cypress from which it derives. In addition, the soft green color of the leaves fits well into any type of landscape. This type of plant for garden hedges has a very fast and dense growth but it should not be allowed to grow more than 4 meters in height , because having a reduced root system, it can yield under the action of strong gusts of wind. To make it grow well, we must ensure it is exposed to the sun and good care when planting it, anchoring it well to the ground and leaving a space of about 50-70 cm between one plant and another. Fruit flowers are very rare , for this reason Cypress Leyland is ideal for those who want to have a hedge of a uniform color throughout the year.
It's a evergreen plant of Japanese origin, very elegant that grows spontaneously also in Europe. Not all privet varieties are suitable for hedging, so you will have to be careful to choose the variety of Common privet you hate Japanese privet which in addition to being evergreen, easily reach heights of 4-5 meters. During flowering, which goes from June to September, the plant is filled with small and fragrant white flowers, while in winter the green and black berries are replaced by the flowers. For this the Privet is the ideal plant for me for flowering garden hedges . To make it grow well, you need to place it in a sunny or semi-shaded place and with an outside temperature that is not too cold (the ideal temperature is from 12 to 25 degrees). The best time to plant our privet plants is the autumn , in order to allow the plant time to take root well in the ground before the arrival of heat and flowering. To create a hedge, the plants must be planted a about 60 cm apart one from the other. You can also decide to create a hedge with privet plants in pots, which can be easily kept on the balcony or terrace of the house. In both cases, to obtain a dense and covering hedge, it will be necessary to compose two rows of Privet plants , spacing them about fifty centimeters from each other.
- Photinia (Variety Fraseri Red Robin)
One of plants for garden hedges most used because of its beautiful red leaves and ease of cultivation. This plant indeed is very resistant and has few cultivation needs and finds its natural habitat almost everywhere in Italy, where temperatures are now mild and temperate even in winter. Furthermore, Photinia is a plant that lends itself to multiple functions i: from high or medium-height hedges, to low hedges for borders, up to single saplings in pots or in compositions of trees in flower beds and flower boxes. The moment of greatest splendor of this plant is spring, when the leaves are colored with a beautiful bright red and the small and fragrant white flowers appear, while, being a evergreen plant , the Photinia for the rest of the year has a rich foliage of an intense green color. The right time to plant it is the autumn , placing the plants about 1 meter away from each other to give them freedom to grow and watering well, without creating stagnant which would be lethal for this plant. Very important feature of this plant is its ability to absorb smog and fine dust , playing an important role in the conservation and protection of the environment. Due to this characteristic, the Photinia hedge is very often found in urban environments and public contexts and is the ideal plant to create simple, ornamental and protective hedges .
Evergreen garden hedge plant native to Japan that grows spontaneously in the Alps and the Apennines, if you have time it is ideal for you. Of this plant, the dwarf variety , with rounded and very decorative shapes. The Boxwood has one very slow growth , adapts well to living throughout our country, with the exception of the high mountains, because it does not tolerate cold temperatures with many degrees below zero and the leaves are small and bright green.
It tolerates pruning well , which is why it is widely used for decorative hedges of any shape and type. Beware though if you have children or pets being poisonous in all its parts , can cause vomiting and dermatitis if ingested or rubbed into the skin by mistake. As with other garden hedge plants, it is recommended to proceed with the planting in autumn , so that the plant has all winter to create new roots, and to place the plants in an area that is not too sunny. Its slow growth is rewarded with its own longevity: a Boxwood plant can live in fact up to 600 years.
- Climbing jasmine
It's a very popular climbing plant for flowering garden hedges , but also grown in pots, to embellish terraces and balconies. This plant is also suitable for indoor environments such as in apartments, the important thing is that it is exposed to direct sunlight, therefore close to windows and sources of natural light.
It is a simple species to grow, versatile and hardy and can be used for hedges with different functions: from the lining of gates and walls, to the creation of natural barriers to ensure the privacy of homes. For the planting of the plant it is ideal the choice of beautiful sunny and bright places , sheltered from strong gusts of wind that could damage the plant and with supports and trellises that help its growth. Jasmine resists drought well but needs a soil very rich in compost and organic substances, fertile and well drained in order to grow quickly. In addition to its decorative beauty,
The botanical name is Crataegus, while the more common name is Hawthorn and it is due to the fact that the most widespread species in Europe and Italy have white flowers, similar to very small roses and the branches bear very sharp thorns . The foliage is dark green and the flowers are followed by small fruits edible bright red color. Although Hawthorn is not a widely used garden hedge plant, it remains a good choice if you want to create a luxuriant and flowery defensive barrier , which can grow into height up to 4-5 meters. To ensure fast growth, the Hawthorn must be planted in autumn and in sunny places, watering it abundantly. Hawthorn fruits and leaves contain multiple active ingredients and are used in folk medicine against various diseases, from heart problems to insomnia, as ingredients of herbal teas and syrups.
Pyracantha is one evergreen garden hedge plant native to Asia and has a rather fast growth, rapidly reaching 2-3 m in height. This plant also is very decorative: the leaves are small, dark green, the flowers are white in the shape of a star and very fragrant and they are born in spring, while in autumn they mature on the plant rounded orange fruits which sometimes remain on the plant until the following spring, ensuring decorative flowering of the hedge throughout the year. You need to place them in sunny places , are robust plants that also resist pollution and salt, but to grow well they need plenty of natural light and well-drained and fertilized soil.
Hibiscus is a plant for garden hedges native to Asia and very widespread in Europe and Italy as a plant for decorative garden hedges. It has an erect and well-branched habit, grows up to a height of two or three meters, and blooms in spring until the cold autumns with beautiful bell-shaped purple and pink flowers. The leaves are light green with an oval and serrated shape. These plants are often chosen as garden hedges due to their vigorous growth and flowering beauty. Even if they are not evergreen, so in winter the branches will strip of leaves, hibiscus plants have the advantage of not needing special care during the winter and do not risk getting sick from dying due to frosts, but of course they interrupt the flowering to start again the following spring. When planting, it is important to guarantee this plant plenty of water and light, but keep it away from drafts and away from too much direct sun.
Laurel is one evergreen garden hedge plant widely used in gardens to create decorative hedges and to delimit the boundaries between houses or portions of gardens with different functions. They can also be found in gardens and public spaces, since this plant is of easy cultivation, very resistant to external agents and parasite attacks and is typically Mediterranean. In summer, Laurel blooms producing small white flowers, while its foliage is a splendid dark green color all year round. If properly pruned and cared for, this hedge can last many years without showing signs of aging and can grow up to a height of 10-12 meters. To ensure optimal growth, it is necessary to intervene with the right irrigation, wetting the soil when it is dry and avoiding water stagnation, which reduce the vigor of the hedge. There ideal pruning is done twice a year: in June and October and consists in the elimination of dry or damaged leaves and branches and to contain their shape and growth. The laurel hedge does not only have a protective or delimiting function: its own leaves in fact they are a lot also used in the culinary field , to flavor meat or to prepare excellent purifying herbal teas.
What are allergenic plants?
Allergenic plants are those herbaceous plants, shrubs and those with tall stems which, due to the pollen released during the flowering period, cause allergies in predisposed subjects and which, according to what is declared by the Ministry of Health, today constitute about 60% of the population or 1 out of 4 citizens.
For this reason, in addition to determining the type of plant to which you are allergic, it is important to know the periods in which these plants bloom in order to protect themselves from pollen which, being very light, are carried by the wind even at a considerable distance from the place of production.
Plants that cause allergies
There are many plants responsible for allergies: some less known, others more known and widespread in a rustic state almost everywhere in our area, still others frequently grown in pots, in the open ground in gardens and public parks.
Parietaria officinalis also known as wall grass is a herbaceous plant rich in histamine, a known allergen that causes allergic reactions in many predisposed individuals and which generally manifest themselves with widespread itching in various parts of the body. Despite the richness of allergens, the leaves and tender stems of this plant, which have always been consumed in peasant cuisine, are still excellent ingredients to add to soups, omelettes and mixed vegetables. In folk medicine, parietaria poultices are used in case of skin infections.
Rustic grasses and ornamental grasses, much sought after and appreciated for their resistance to adversity, the beauty of their ears floating at the slightest breath of wind, are the first cause of pollen allergies in Italy.
These plants spread spontaneously throughout our territory, produce a lot of pollen and for a very long period as the different species bloom practically throughout the year, from spring to late autumn with maximum intensity. between May and July. The prolonged flowering of grasses caused by climate change obviously causes more problems for longer periods for those who are allergic to it.
Artemisia 0 Ambrosia
A herbaceous plant, widespread in the countryside, in the hills, in the mountains and in the plains in vegetable gardens and uncultivated land. Ambrosia, scientific name Ambrosia artemisiifolia, is the second most important cause of allergy in Italy after grasses. It produces ears in panicles rich in pollen which by simple contact causes allergic attacks that manifest themselves with itching and burning in the eyes and in the most sensitive subjects even asthmatic crises accompanied by breathing difficulties. It blooms from June to September with maximum peaks in August. This common herb is also on the list of plants against bees and wasps as its pungent scent bothers their delicate sense of smell.
A very common and widespread stinging herbaceous everywhere appreciated for its many beneficial properties but which in predisposed individuals can cause severe allergic reactions: the skin rash is excessive and is accompanied by breathing difficulties, swelling of the lips and tongue, diarrhea
The hazelnut is a fruit tree also grown in the family vegetable garden and in country gardens as an isolated bush or an informal hedge.
It blooms between January-February. It produces male flowers gathered in a hanging cluster inflorescence formed by numerous stamens rich in pollen with a high allergen content.
An elegant and imposing deciduous tree widespread in all temperate zones of our hemisphere. In Italy it grows in the woods up to 1500 meters above sea level and is widespread above all in the Center-North. It is known in Italy as the manna ash and even if it has been known since ancient times for its beneficial properties and for the production of manna, appreciated for its anti-inflammatory, antirheumatic and diuretic activities but because of its pollen-rich flowers. it is also the cause of severe allergies. The flowers gathered in small panicle or spike inflorescences, first erect then pendulous, appear on the apexes of the branches between March-April.
It is a fairly fast growing tree, in fact it usually takes about twenty years to reach its maximum height. The branches are thin, the small, light green leaves turn yellow in autumn, the bark, smooth and thin, turns white with age, and develops characteristic black streaks where it peels off. The flowers are long yellowish-brown catkins. It blooms in the fall.
A tall tree used for resistance to smog in urban furnishings, in public parks and for ornamental purposes even in very spacious gardens. During the flowering period very small, unisexual flowers appear, collected in a globular flower head generally carried single on a long peduncle. It blooms from April to May and the enormous amount of pollen produced generally locally causes moderate allergies. Nevertheless, in recent years, more attention has been paid to which plants to plant to avoid potential allergies to citizens and local inhabitants.
Symptoms of plant allergies
The most frequent symptoms caused by plant allergies at the time of their flowering are:
- burning in the eyes
- a runny nose
- dry throat
- swollen tongue
- respiratory difficulties
Yellowed leaves: what are the causes of the deficiencies and how to remedy
Written by Re Vivo on 20 September 2016. Published in Orto e Giardino, Permaculture.
Do your plants have yellow leaves? Here are what could be the causes and some solutions to remedy them
The yellowed leaves they could indicate nutrient deficiency, the presence of holes, an attack of bed bugs, white spots or a disease called Oidium. We learn to observe our plants: it is vital to ensure their survival.
Today, we'll look at the ones that can lead to yellowing leaves.
Too much water
If the yellow color is almost uniform and bright, affecting many of the leaves on the plant, it could mean that you are exaggerating with watering. Or that maybe the soil does not allow the correct drainage of liquids.
The solution could be to change the composition of the soil, mixing it with sand and, if necessary, transplant it into another pot.
Iron, together with magnesium, is one of the main constituents of chlorophyll. The yellowed leaves also respond to the name of "chlorosis", which precisely indicate an absence of chlorophyll in the plant.
The yellow color begins to affect the whole leaf, with the exception of the veins, where the chlorophyll is concentrated. The plant weakens and the leaves begin to fall. A timely intervention can in this case avoid the death of the plant.
It is important to fill the shortage of this mineral. Adding compost.
A guide to recognizing nutrient deficiencies or plant growth problems
Too alkaline soils
Plants can also turn yellow due to too alkaline soils or water rich in limestone. This makes the leaves more vulnerable to attack by parasites. An alkaline soil, in fact, hinders the absorption of iron. In this case, there are several acidophilic plants capable of changing the quality of the soil.
Too low temperatures
In some cases, yellowing leaves can also just mean that the plant has been exposed to too low temperatures. In this case, cover it or just move it.
Deficiency of magnesium or sulfur
In this case, the leaf turns yellow towards the central part and the tip and remains green at the attachment.
What to do?
In addition to the advice already given, you can carefully remove yellow leaves, too weak, sick or full of parasites. If the plant is in a pot, you can decide to transfer it to a larger container. Always check the quality of the soil, enrich it with homemade compost and find a more sunny spot.
Hybrid between Photinia glabra and Photinia serrulata, Photinia Red Robin is a plant obtained in New Zealand. It is an erect shrub, then roundish, with many thick branches. It is characterized by bright green evergreen leaves: those of the new vegetation are of an extraordinary scarlet red that gradually turns green in spring-summer. In May it produces small, white-pink flowers, gathered in panicles. Photinia Red Robin withstands any pruning and is suitable for both compact hedges and living in containers of any size. It can reach about 3-5 m in height and 3-4 m in width. Withstands temperatures down to -25 ° C and adapts to both sun exposure and partial shade. These characteristics, combined with the extraordinary immunity to the most common diseases and parasites, make it one of the easiest plants to succeed and in the last 20 years it has become very famous throughout Italy.
"PACK" OFFER - purchase in free number, with a minimum order of 10 plants.
BUSH PLANTS VASE 7 cm - PLANT HEIGHT 20-30 cm
To make a hedge, we recommend using about 3-4 plants per meter
Read the characteristics of Photinia Red Robin and the advice for planting on the article in the blog.
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Popular varieties of hedges
Faslo cypress (Lawson's cypress)
COMPO Concime per Conifere con Guano
Per la concimazione delle vostre siepi potete utilizzare COMPO Concime per conifere con Guano, adatto a tutte le sempreverdi
Qual è il momento migliore per piantare siepi?
Il periodo migliore per piantare le siepi è l'inizio dell'autunno. Il terreno è ancora abbastanza caldo in modo che le piante possano attecchire bene prima dei geli. Nella stagione successiva, ciò si trasforma in un chiaro vantaggio di crescita. Le piante sempreverdi che sono un po’ sensibili al gelo intenso, come lauroceraso, tasso o nespolo comune, possono essere danneggiate durante i mesi invernali. È meglio quindi piantare queste specie in primavera.
Riconoscere e capire diversi tipi di siepe
QUESTO È CIÒ CHE DOVRESTI SAPERE QUANDO SCEGLI LE PIANTE DA SIEPE
Faggio e carpino
Sono specie diverse, ma affini per tipologia e comportamento, adatti per siepi alte e strette crescono rapidamente ma in modo compatto, perciò in genere è sufficiente una sola potatura annuale. In autunno entrambe le specie, ma il carpino in particolare, tendono a conservare a lungo le foglie secche sui rami la colorazione autunnale è dorata e splendida, poi si spegne con l’arrivo dell’inverno, ma il fogliame secco offre rifugio agli uccelli selvatici che rimangono in inverno senza migrare al caldo, come merli e passeri inoltre, la presenza delle foglie conserva le caratteristiche di protezione della privacy. Si tratta di specie atossiche, ideali anche in presenza di bambini, sensibili al ristagno idrico ma resistenti al gelo, al caldo e a periodi di siccità la potatura è facile. Per ottenere rapidamente uno schermo compatto occorre piantare esemplari alti circa un metro e distanziati di 80-100 cm.
Una siepe di tasso è compatta tutto l'anno e, con il suo colore verde scuro, offre lo sfondo perfetto per aiuole di fiori colorati. Cresce abbastanza lentamente, intorno a 15 cm l’anno, ma è estremamente resistente e senza complicazioni. I tassi crescono in ogni tipo di terreno, ma affinché la pianta possa crescere vigorosamente e raggiungere un’età avanzata, è bene preferire terreni umidi e calcarei, anche argillosi. In presenza di terreno e aria molto asciutta sono più sensibili agli attacchi di acari. Il consiglio è di scegliere esemplari di 80-100 cm di altezza collocando tre piante per metro lineare. Anche se la siepe di tasso cresce lentamente, dovresti potarla una volta all'anno. Solo in questo modo il legno si ramificherà bene nella zona inferiore e colmerà gli spazi tra le singole piante. Dopo alcuni anni la pianta inizierà a sviluppare bacche rosse. Sono una prelibatezza per gli uccelli, ma sono una tentazione pericolosa per i bambini perché sia i semi nelle bacche, così come tutte le altre parti della pianta del tasso.
Il falso cipresso (cipresso di Lawson, Chamaecyparis) è una delle tante specie che appartengono alla famiglia dei cipressi. Se stai pensando a una siepe fatta di cipressi hai a disposizione un'ampia scelta di colori, che vanno dal giallo al verde chiaro, dal verde scuro al verde-azzurro. Le radici del cipresso vanno in profondità e in pochi anni le piante formano una siepe sempreverde e compatta, ma è facile che gli esemplari perdano la vegetazione nella zona inferiore in carenza di la luce solare. Il falso cipresso è molto diverso dal cipresso toscano (Cupressus sempervirens) e non riesce a tollerare potature eccessive e frequenti. Dovresti usare il tagliasiepi non più di una o due volte l'anno. Assicurati che la siepe sia sempre un po’ più larga dall'alto verso il basso, in modo che i raggi del sole possano arrivare ovunque. Per un giardino con animali domestici e bambini piccoli, il falso cipresso non è la scelta ottimale perché tutte le parti della pianta sono velenose. Difficilmente il falso cipresso vive più di 30 anni in forma di siepe il cipresso toscano, invece, è spesso plurisecolare!
Le foglie del lauroceraso sono insolitamente grandi per una siepe. Di conseguenza, una siepe di lauroceraso non può essere tagliata in modo preciso, ma grazie alla sua velocità di crescita si trasforma in pochi anni in un muro verde di altezza maestosa. La pianta è meravigliosamente semplice: tollera terreni asciutti e compatti, così come il caldo e il gelo intenso. Inoltre, è relativamente poco costoso e, vista la rapida crescita, è sufficiente piantare due giovani piante per metro lineare. La siepe deve essere potata a mano almeno due volte l'anno, perché quando si usa un tagliasiepi elettrico le foglie grandi si sfilacciano e sviluppano bordi marroni. Verso l'inverno la siepe si adorna anche di lucenti bacche nere, che però sono tossiche se ingerite: attenzione ai bambini e ai cani!
Il ligustro è una delle piante da siepe più popolari perché non ha particolari esigenze circa il terreno e le condizioni di luce. Il ligustro cresce rapidamente e se l'inverno non è insolitamente gelido, porta le foglie tutto l'anno. A giugno e luglio la siepe di ligustro si arricchisce di fiori bianchi, in autunno la pianta forma bacche nere particolarmente apprezzate dagli uccelli prima dell'inizio dell'inverno. Nel fitto fogliame gli uccelli selvatici amano fare i nidi e trovare rifugio. Una caratteristica non ottimale è la crescita vigorosa se la siepe deve rimanere in forma e a una determinata altezza, dovrai usare le cesoie almeno due volte a stagione. La pianta ha bisogno di spazio per crescere bene: calcolare almeno 50-60 cm tra gli esemplari (alti un metro) e anche di più se le piante sono più grandi.
Ecco una siepe che offre molti motivi di interesse. Il berberis, noto anche come crespino, esiste in varie tipologie, alcune presentano una splendida fioritura gialla, si formano bacche decorative e il fogliame è disponibile anche in varietà rosa-rossicce o variegate. Si tratta di una pianta molto spinosa che svolge quindi una funzione protettiva contro le intrusioni non adatta per siepi alte, ma consigliata per chi ha poco tempo perché cresce lentamente e in genere è sufficiente una sola potatura annuale a fine inverno seguita, se occorre, da occasionali spuntature dei nuovi getti per favorire la ramificazione e l’aspetto compatto. Ha bisogno di molto sole per dare il meglio ed è sufficiente prevedere una distanza di piantagione di 40-50 cm. In terreni fertili e ben drenati ha una vita molto lunga e fornisce un effetto estetico apprezzabile in tutte le stagioni.
Pianta molto diffusa, perché ha una lunga serie di caratteristiche positive: bel fogliame lucido, nuovi getti primaverili di uno splendido rosso vivo, splendida fioritura bianca se non viene potata troppo, resistenza al caldo e al gelo, tollera anche l’ombra, poco sensibile alle malattie, crescita rapida, nessuna esigenza in fatto di terreno, raggiunge altezze considerevoli. Gli svantaggi: occorre potare a mano per non tagliare il fogliame, danneggiandolo ci vogliono anni perché gli esemplari siano sufficientemente folti e intrecciati fra loro per creare una cortina verde compatta e impenetrabile. Cresce rapidamente ma più altezza che in larghezza, pertanto è sufficiente prevedere 2-3 esemplari per metro lineare.
Il fungo provoca macchie circolari, da marrone chiaro a giallo foglia. Le lesioni sono di circa 1 cm di diametro, a volte con strisce e macchie scure.
La macchia bianca della foglia di Brassica è una malattia rara e solitamente benigna delle colture scolastiche. Spesso coincide con le forti piogge invernali. Quando le condizioni sono favorevoli, si può osservare una caratteristica crescita di spore bianche e sfocate nelle macchie fogliari.
Le ascospore si sviluppano sulle piante infette durante l’autunno e vengono poi disperse dal vento dopo le piogge. Le spore asessuate, le conidi che si sviluppano nelle macchie fogliari, sono diffuse dalla pioggia o dagli spruzzi d’acqua, con conseguente diffusione secondaria della malattia. Temperature di 50-60 F. (10-16 C.), così come le condizioni di umidità, favoriscono la malattia.
In alcuni casi, questa malattia può causare perdite significative. Ad esempio, la colza coltivata nel Regno Unito e in Canada ha subito perdite del 15% a causa di questo fungo. Colza, ravizzone, cavolo cinese e senape sembrano essere più sensibili alla malattia rispetto ad altre specie di Brassica come il cavolfiore e il broccolo.
Anche le verdure verdi come il rafano, la senape selvatica e la borsetta da pastore sono suscettibili al fungo, così come il rafano e i ravanelli.
L’agente patogeno non sopravvive nel terreno. Invece, vive di erba e piante di cavoli volontari. La malattia è trasmessa anche da semi infetti e residui del raccolto.
Non ci sono misure di controllo per la macchia di foglie di Brassica. Il trattamento delle macchie di foglie bianche comporta la rimozione e la distruzione delle piante infette.
La prevenzione è il miglior metodo di controllo. Utilizzare solo sementi esenti da malattie o cultivar resistenti. Praticare la rotazione delle colture, la rotazione delle colture scolastiche ogni 3 anni e un’igiene eccellente rimuovendo il materiale vegetale infetto. Inoltre, evitare di lavorare dentro e intorno alle piante quando sono bagnate per evitare di trasmettere il fungo alle piante non infette.
Evitate di piantare vicino o in un campo già infetto e controllate le erbacce dell’ospite e i crociferi volontari.