The growth and development of flowers have two requirements for light, namely, the intensity of light and the length of time.
Flowers are usually divided into two types, which are sun loving and yin loving. Sun loving flowers need to be cultivated in the sun to grow well, such as rose, pomegranate, chrysanthemum, narcissus, scutellaria barbata, sorrel, lotus, etc. If these flowers are placed in a shady environment, the light intensity is not enough, and the branches are often thin, the internodes are elongated, the leaves are thinner, the leaf color is not correct, and they are also vulnerable to diseases and pests. While other flowers originally grown in shady slope or relatively humid environment in the forest do not like direct sunlight, especially in high temperature seasons, they need to be given different degrees of shade, and pay attention to increasing air humidity appropriately. These flowers are called Yin loving flowers, such as Begonia, Adiantum, glass green, asparagus, upside down golden bell, orchid, Clivia, azalea, tortoiseshell bamboo, evergreen, etc.
For general potted flowers, in the flowering period, in order to extend the flowering time, strong light can be appropriately reduced, such as roses, chrysanthemums, etc. But some flowers, such as water lily and scutellaria barbata, can bloom well only under strong light. There are also some flowers that do not like strong light in summer and cannot blossom without light in winter, such as geranium, begonia all the year round, hydrangea, upside down golden bell, etc.
The length of sunshine is particularly important for controlling the flowering of flowers. Some flowers are native to low latitude areas, and can only blossom in short sunshine. The flowering period can be controlled artificially by taking advantage of the characteristic that flowers need sunshine time. To promote its early flowering.
