Why does hydrangea only grow leaves but not bloom?

Hydrangea gets its name because its flower shape resembles a hydrangea, and it is highly favored for its attractive flower shape and rich colors. However, some friends find during cultivation that their hydrangea only grows leaves but does not bloom. What causes this? Let's take a look together.

1. Improper pruning

The flowering period of hydrangea is generally from April to June. New seedlings generally do not bloom in the same year and will only bloom the following year. Basically, hydrangea generally blooms on old branches. However, if old branches are not pruned in time, it will affect flowering the following year. But also be careful not to prune all the old branches, otherwise it will be extremely difficult to bloom the following year. After hydrangea blooms, pruning should also be done. Keep 3-4 buds on each branch and cut off all the rest. The best time is generally from August to September, otherwise it will affect flowering the following year.

2. Light reasons

Hydrangea is a short-day flowering plant. If the light period is too long during flower bud differentiation, it will affect flower bud differentiation, which will result in very few flowers. However, insufficient light can also cause failure to bloom. Hydrangea is shade-tolerant, but if it cannot receive sunlight for a long time, it will grow poorly, which will affect photosynthesis and make flowering less likely. Therefore, during cultivation, it should be given sufficient light so that it can produce more beautiful flowers.

3. Fertilizer and water reasons

Plant flowering cannot be separated from fertilizer and water. Especially in spring, phosphorus and potassium fertilizer should be applied in advance to promote flower bud differentiation so that it can bloom. However, note that before flowering, nitrogen fertilizer should not be applied too much, otherwise it will affect flowering. Improper watering is also one of the reasons hydrangea does not bloom. During watering, if too much water is given, it will cause the potting soil to dry out, making it unable to absorb effective moisture and resulting in failure to bloom. Too much watering will cause water accumulation, leading to root rot in the potting soil, and it will not bloom either. When cultivating hydrangea, watering and fertilizing should be determined according to plant growth and the season.

4. Temperature reasons

Under normal circumstances, the most suitable temperature for hydrangea is 18-25 degrees. If it is under high temperature in summer, its growth posture will be affected, causing failure to bloom. However, when the winter temperature is too low, it will cause frost damage to the plant, making flower bud differentiation impossible, and flowering will not occur either. During summer care, once the temperature exceeds 30 degrees, shading treatment and spraying water mist are needed to lower the temperature promptly. In winter, it is recommended to place it in a greenhouse for care and keep the temperature above 10.

The above is an introduction to the reasons why hydrangea only grows leaves but does not bloom. I hope it can help you. To learn more related knowledge, please follow us.