I. illumination
Jiazhutaoxiguang, like warm and humid climate. It should be cultivated in a sunny and windproof environment. If the sunshine is not enough, the flowers will be light.
II. Soil
Oleander is full of skin and bears barren and drought. It is suitable to grow in fertile and loose soil with good air permeability.
III. temperature
Oleander should be planted in the leeward and sunny place, and potted plants in the North should be placed indoors to prevent freezing, or the branches can be tied up and bagged and put in the leeward and sunny place for winter, and the room temperature should not be lower than 0 ℃. If the temperature is too high, it will consume nutrients, which is not good for the growth and flowering in the second year. If the outdoor temperature is high in winter, soil can be cultivated to keep warm. In the area with - 5 ℃ low temperature, the plants must be dug out at the end of autumn, potted and planted, then moved into the low temperature room, and then moved to the outdoor sunny place in late April of the next year.
IV. water content
Although oleander likes water, it is afraid of waterlogging and is very drought resistant. In case of continuous rainy days, the water in the basin shall be dumped in time to prevent rotten roots. Too much watering will make the leaves turn yellow and fall off one after another, which will affect flowering. In spring and autumn, the basin soil shall be watered according to its wettability. In the summer of vigorous growth and flowering period, it is better to water once a day in the morning and evening, and pay attention to spray and wash the branches and leaves frequently to keep the leaves fresh and green. Enter the house in the middle of October. After entering the house, water should be controlled. Do not use too much water. Otherwise, it is easy to rot roots and take off leaves, which will affect the growth of the next year.
V. fertilization
Oleander is fond of fertilizer. It can be applied with thin liquid fertilizer every 20 days or so from going out of the house to flower withering (Frost). After autumn, it grows rapidly. At this time, fertilizer and water can be applied once every 15 days or so until it enters the house. Potassium fertilizer rich in plant growth elements can be used. Applying more phosphate fertilizer at flowering stage can not only promote the flourishing of flowers and leaves, but also ensure the healthy growth of plants. Generally every 10 days and a half months. In winter, fertilizing again before freezing can ensure the nutrient supply of plants and improve the cold resistance of plants. It can help the plants survive the winter safely and reduce the possibility of being damaged by freezing. In spring, when the basin is transferred, sufficient base fertilizer should be applied, and then thin fertilizer should be applied once a week, mainly the fertilizer rich in potassium and phosphorus. After survival, reduce fertilization, and change fertilization varieties at intervals, mainly to promote growth and flower growth.
Vi. trimming
If oleander is allowed to be uncut, its plant shape is too large, so it is necessary to arrange branches or stems when it is cultivated in clumps. The sprouting force is stronger than cutting in the middle of the branch, and most of the twigs can be sent out from the incision to affect the plant shape, so in principle, it must be cut off at the base of the branch.
