Why don't hydrangeas bloom?

To ensure the normal flowering of hydrangea, you need to pay attention to the following points: reasonable fertilization, appropriate light, winter cooling, and timely pruning.

The main reasons for not flowering are as follows:

Too much nitrogen fertilizer

The demand for fertilizers for the Eight Immortals Flower is relatively high during its growth period. In the early stage of flower bud differentiation, nitrogen fertilizer is mainly used to promote branching; during the differentiation period, phosphorus fertilizer is mainly used to promote flower bud growth. However, the daylight hours are short in autumn and winter, and the growth of hydrangea is relatively slow. If excessive nitrogen and phosphorus fertilizers are applied, the plant will suffer from overnutrition, growth will be inhibited, flower buds will be difficult to differentiate, and flowering will be affected in the second year!

Too little light

Home cultivation is limited by conditions and receives less sunlight, which can cause the leaves to grow too long and grow poorly. The leaves consume too much nutrients, resulting in insufficient nutrition when flower buds differentiate, which affects flowering.

Too long light exposure

Hydrangea is a short-day plant. During the flower bud differentiation period, the lighting time should not exceed 10 hours. Normally the lighting period will not be too long. However, for hydrangeas placed indoors, long-term exposure to light at night will increase the light and affect the differentiation of flower buds.

Winter room temperature is too high

The flower buds of Hydrangea differentiate after flowering, that is, in autumn and winter. Due to the influence of the long-term growth environment, it adapts to this lower temperature environment during this period. The temperature is usually between 5 and 10 degrees Celsius. Too high a temperature will affect differentiation. Hydrangeas are often kept indoors at home, but when the temperature is above 18°C, the flower buds have difficulty differentiating normally.

Not suitable for pruning period

The flowering period of hydrangea is from June to July. Usually the branches need to be pruned after the flowering period to reduce the loss of nutrients. If the plant grows too vigorously and is heavily pruned in early spring, it will be difficult to form flower branches from June to August, resulting in reduced or no flowering.