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How to grow oleander: info on garden cultivation and potted oleander, care, pruning, exposure and plant needs. Poisonous oleander.
Let's start with the classic question:Is the oleander poisonous?
The answer is yes. Both the leaves and the stems of the oleander are poisonous, even seeds and flowers can be poisonous in different sizes. The substance that makespoisonous oleanderis calledoleandrina, it is a cardiotonic glucoside that acts on the functioning of the heart. Ingestion of oleandrin can give rise to symptoms of different entity, the most common symptoms are gastrointestinal (nausea, diarrhea and vomiting), abdominal pain, excessive salivation ... The most dangerous effects are those affecting the heart that occur with arrhythmia ( irregular heart beat) and cardiac arrest.
Oleander, cultivation and care
L'oleander, Nerium oleanderit is a very resistant evergreen shrub and for this reason it is massively cultivated in urban environments. It resists salt and drought: it is a plant grown for ornamental purposes and its cultivation is simple. The oleander can stand the cold, thrives well in its ownphytoclimatic zonewhich provides temperate, sunny and sheltered from the cold.
Oleander in pot
Despite its bushy posture, theoleanderdoes not fearpruningand therefore can be tree-grown for cultivation injaror to create evergreen tree-lined avenues with suggestive and abundant flowering. For who wantscultivating oleander in pots, must keep in mind that even the sapling-shaped cultivation has a high growth: the oleander is very long-lived and cultivated as a sapling can reach a height of up to 6 meters.
How to prune the oleander
Thereoleander pruningit is necessary not only for containment purposes: if you let the oleander thrive, it will form a messy bush that is easy prey for fungal attacks and other parasites. Pruning is necessary to ensure good aeration even between the innermost stems of the plant; therepruningmoreover, it is the most efficient "therapy" for the treatment of oleander mange. Oleander mange is the most widespread adversity for this plant, it must be treated by cutting off all affected branches and, only after eliminating the diseased part, by administering a copper-based fungicide.
When to prune oleander?Pruning is done after the first summer flowering, in August. Pruning is done to limit excessive vigor of the plant. Even in spring you can trim the branches by shortening them by 3 - 4 cm in order to favor the emission of lateral shoots and therefore of flowers.
White oleander and colorful flowers
They exist on the marketoleanderscome onflowersof different colors. The flowers can be single or double, they are often fragrant and you can choose between different colors. The white oleander is among the most common along with the pink oleander, however there are oleanders with yellow, red, salmon and orange flowers.
When buying, choose well-stacked plants that do not have cuts at the base that testify to the suppression of diseased or poorly developed branches.
How to grow oleander
Therecultivation of oleander it is very simple, there is little care to be given to the plant as well as the needs of this very rustic species. Forcultivate oleanderyou just have to follow the instructions:
Choose a sunny area in order to obtain abundant blooms.
- Irrigation of potted oleander
Irrigate the potted oleander often and abundantly. Potted oleander should be grown in raised containers that allow the water to flow, so do not use any saucer.
Use a mixture of two parts of leaf earth and / or manure compost, two parts of flower soil and one part of coarse sand.
L'oleandercan stand the cold, it can also be grown in northern Italy as long as the temperatures do not drop below zero for prolonged periods. The cold (temperatures below zero) burns the leaves while when the temperatures persist below zero (temperatures below -5 ° C) the plant is destined to die.
- Protect the plant from the cold
For oleander cultivation in pots, remember to protect the roots with cardboard and straw with the mulching technique and isolate the bags by wrapping newspapers and plastic.
The fertilizer should be administered above all in the case of oleander in pots, with open field crops, the fertilizer is used to promote flowering.