First, lack of fertilizer, hibiscus flowers like fertilizer, especially in the flowering and bud-bearing period, which requires a lot of phosphorus and potassium fertilizer. Only applying nitrogen fertilizer not only does not bloom, but also the branches are white and long, and the nutrition is scattered, so it is difficult to form flower buds, so fertilization must be balanced.

Second, lack of light, hibiscus flowers are sunny, lack of light can not form flower buds, but also can not bloom, so the conservation environment must be sunny, even in hot summer, it can not shade, otherwise it will not bloom, and yellow leaves will fall.

Third, the temperature is uncomfortable. Hibiscus flowers need high temperature conditions. The temperature is between 20-35℃, and the growth is slow below 20℃. It is easy to shed leaves below 10℃, and it will freeze below 5℃.

Fourth, improper watering, hibiscus flowers like water, are not resistant to waterlogging and drought, otherwise yellow leaves are prone to fall, leading to poor plant growth and difficulty in budding and flowering.