Poinsettia, also known as ivory, blooms from autumn to winter. A similar plant of Camellia. During Christmas, it is also called Christmas flower. It has green leaves and bright flower buds, such as white, light yellow, pink, scarlet, etc. among them, the red double bract is the top-grade product, and its flowering period is long, which is in the middle of Christmas, new year's day and Spring Festival. It is the most suitable potted plant for decoration of houses, buildings, halls, pavilions and offices. It is an important ornamental potted flower and cut flower material in winter and spring. But in the process of breeding, we will inevitably encounter a variety of problems, such as the yellowing and shedding of cotyledons. Today we will talk about the issue of Poinsettia Leaves.
Poinsettia is native to Mexico and tropical Africa. Now it is widely cultivated all over the world. It can be planted in open fields in the south of China, but it can only be potted in the north and needs to be cultivated as greenhouse flowers. Euphorbia pulcherrima is a plant with short sunshine. It likes warm climate and strong sunshine. It requires loose and fertile soil with good drainage and good ventilation. It also requires strict water content. If the soil moisture is too high, it will often cause root disease, and then lead to fallen leaves; if the soil moisture is insufficient, the plant will not grow well and will also lead to defoliation. The following is a brief introduction of several measures to prevent and control leaf loss:
1. Poinsettia is afraid of dryness and waterlogging.
If it is too dry to meet the hot sun, it will make the plant physiological water shortage, then the leaves curl and a large number of leaves fall. If the basin soil is too wet, the plant canopy density is large, photosynthesis can not be carried out well, resulting in malnutrition, leading to defoliation.
Therefore, water every two days in spring; in summer, when the branches and leaves are flourishing and growing fast, the amount of water should be large. In case of rainstorm, the potted plants should be drained or moved indoors before the rain; in autumn, the water should be watered once every day at about 10:00 a.m., and the pot bridge will be moved into the greenhouse at the end of autumn, so the plant growth is very slow, and the frequency and amount of water and fertilizer are gradually reduced; In winter, it is necessary to keep warm and antifreeze. Water should be watered at noon every other week on a sunny day, and the water temperature should be close to the soil temperature.
2. Avoid direct sunlight in summer.
The potted plants should be placed in a well ventilated place with a distance of 50 cm between the pots. Water should be sprayed frequently on the ground to increase the humidity of the air, which can effectively control the leaves falling due to high temperature and drying.
3. Poinsettia is Xiyang.
Euphorbia pulcherrima is a short day plant. It needs sufficient sunshine during the growth period of stems and leaves to promote the rapid growth and prosperity of stems and leaves. To make the bracts turn red in advance, the daily light should be controlled within 12 hours to promote flower bud differentiation. If the light is 9 hours a day, the bracts will turn red after 5 weeks. The loose and fertile sandy soil with good drainage is better. The best potted soil is the mixture of culture soil, rotten leaf soil and sand.
4. Poinsettia likes fat.
In the growth period, more nitrogen fertilizer is needed, and insufficient nitrogen fertilizer will cause the leaves at the lower part of the plant to fall off. In addition to the application of delayed base fertilizer in the pot, the thin cake fertilizer water with alcohol is applied every 7 days or so within one month after picking the heart. Excessive fertilization will easily cause root rot. During flowering, do not apply more fertilizer, otherwise it will produce the phenomenon of leaf bud burning. Before entering the room in winter, 40% fermented human manure can be applied.
5. Poinsettia likes warm, humid and cool climate.
If the temperature is above 15 ℃, it is not suitable for the leaves to fall off at night. If it opens a window to blow a cold wind in winter, it will also lead to a large number of fallen leaves. Therefore, too low temperature is the main reason for defoliation. Therefore, it is better to keep Poinsettia in high temperature and stable environment in winter.
Potted Poinsettia