What is the effect of light on the flowering of flowers

The purpose of people to cultivate flowers is to make them produce more flowers. The number of flowering depends on the growth of flower buds, and the time of flowering depends on the differentiation and growth of flower buds. Light is the most effective external cause to promote flower bud formation. On the same flower, the branches that receive more light have more flower buds, but the branches that do not receive enough light have fewer flower buds. When there are many sunny days in summer, flowers will receive plenty of sunshine and there will be more flower buds in the coming year.

According to the requirements of flowers for the length of light time can be divided into three categories: 1, long sunshine flowers: flowers that need more than 12 hours of sunshine every day to form flower buds, which are called long sunshine flowers. Flowers that bloom in spring and summer mostly belong to long sunshine flowers, such as iris, chrysanthemum, impatiens and so on.

2. Short-day flowers: flowers that can form flower buds only when the sunshine time is less than 12 hours a day is called short-day flowers. For example, poinsettia and chrysanthemum can only grow in the long sunshine in summer, but can not carry out flower bud differentiation. After autumn, the same day's sunshine is reduced to 10: 11 hours before flower bud differentiation begins.

3. Sino-Japanese flowers: flowers whose flower buds are not strict with the length of daytime sunshine are called medium-sunshine flowers, such as calla lilies, carnation, hundred-day grass, rose, mulberry and so on. They have no obvious response to the duration of light, as long as the temperature is right, they can blossom all the year round.