Why does Poinsettia drop its leaves?

1. Too much light

Poinsettia likes light. Under the appropriate light intensity, the leaves will become more red. However, the summer sunlight is too strong. If it is not ventilated in time and the air humidity is increased, the plant will wilt, the leaves will turn yellow, and the leaves will fall off.

Therefore, in summer, they should be placed in a well-ventilated place, with a distance of 50 cm between pots. Water should be sprayed on the ground frequently to increase the air humidity. This can effectively control the leaf fall caused by high temperature and dryness. In other seasons, normal sunlight can be allowed, but direct cold wind should be avoided.

2. The temperature is too low

Poinsettia is not cold-resistant. The most suitable temperature for its growth is 15~20℃. After winter, the temperature should be kept above 15℃ and not lower than 5℃. If it is not moved indoors in time and the temperature is not properly controlled, it will cause leaves to fall. In addition, if you open the window and let in cold air once in winter, the poinsettia will shed its leaves.

Since low temperature is the reason why poinsettia leaves fall, the temperature should be appropriately raised in winter, and the temperature should be kept constant, so that the plant can be maintained in a relatively stable environment.

3. Improper watering

Poinsettia likes moisture but is afraid of waterlogging. The soil in the pot cannot be too wet. If you water it too much, the plant cannot photosynthesize well, and the plant will grow poorly and shed leaves. If you water too little, the plant will suffer from physiological water shortage and the leaves will curl and fall off in large numbers. ,

Therefore, poinsettia should be watered appropriately, not too much. Usually, it is watered once every two days in spring. In summer, when the branches and leaves are lush, the plant grows faster and can store more water. It can be watered once a day to ensure sufficient water, and water should be sprinkled frequently to increase humidity. For outdoor breeding, if heavy rain occurs, it is necessary to shelter from the rain in time.

4. Improper fertilization

Poinsettia likes fertilizer and needs various trace elements to grow, especially nitrogen. If there is insufficient nitrogen fertilizer, the leaves will become dull in color and fall off easily.

Apply enough base fertilizer at the bottom of the pot when repotting every year. After pruning, apply a thin layer of cake fertilizer water once every 7 days, and apply fertilizer before flowering. Do not fertilize during flowering, otherwise the leaf bracts will burn. Before bringing the plant indoors in winter, applying a small amount of compound fertilizer will help it survive the winter. Be careful not to over-fertilize to avoid burning the roots.