1. Due to environmental reasons, most rhododendrons sold in the market are cultivated in greenhouses. After buying it back, it can't adapt to the natural environment of the family, and often leaves and even dies;

2, improper fertilization, if the fertilizer concentration is too high, it will also cause its leaves to fall off;

3, improper watering, the roots of rhododendrons are slender and not drought-tolerant, and it is not good to water too much or too little, which is easy to make rhododendrons fall leaves;

4. Rhododendron is an acid-loving flower, and the ph value of the soil should be stable between 4.5 and 6. If tap water is irrigated regularly, the soil will also become alkaline. Alkaline soil, alkaline water and azaleas are unbearable. In alkaline environment, rhododendrons not only shed leaves, but even die;

5. Diseases and insect pests are also the causes of azalea defoliation. Brown spot is a major disease of rhododendron, which will make the damaged rhododendron yellow and fall off after the initial onset. This disease often occurs when the humidity is high in the rainy season.

Rhododendron Also known as Euphorbia, Shan Shiliu and Rhododendron, they are deciduous shrubs of Ericaceae. There are about 900 kinds of azaleas in the world. China is the country with the widest distribution of rhododendrons, with about 530 species. Rhododendron is one of the top ten traditional famous flowers in China, with many kinds and beautiful flowers and leaves. Legend has it that azaleas were dyed by a bird that vomited blood.

Rhododendrons are abundant in southwest Chongqing, Youyang and Xiushan, and most of them are called Yingshanhong.