1, pruning error
Most of the reasons why hydrangeas don't bloom are caused by pruning mistakes, because most varieties of hydrangeas are propagated by old branches, including endless summer, and new branches and old branches can bloom. After the pruning is wrong, even if the new branches grow and bloom, the flower heads will become smaller and the flowering period will be delayed, so the pruning must be correct. Moreover, hydrangeas are mostly big flowers, so it must be remembered that hydrangeas are old branches.
This kind of old branch must be old when it grows in the same year, and it will not grow buds and bloom until the next year, so pruning must be timely. Generally, after entering August, all hydrangeas should not be trimmed. Prune in time after flowering, and keep the lateral buds that grow afterwards. These buds will naturally stop growing at the end of autumn, and will emerge from the top the next year, in endless summer, as well as other varieties of hydrangea.
2. The indoor temperature is too high in winter
If the indoor temperature is always high and grows very fast in winter, most varieties of hydrangea will not bloom, and its branches are always tender green at the top. So try not to let the temperature get too high in winter. Some people put it directly indoors and keep the temperature above 20 degrees. It is not appropriate for it to grow all the time.
Put it near a cold window or in an aisle. As long as the temperature of most hydrangeas is not lower than MINUS 10 degrees, there will be no problem. Let it stop growing for a short time, at least for more than a month, the branches will thicken and harden, and then the top will germinate quickly.
3. There is no antifreeze at low temperature
As long as the temperature of hydrangea is not lower than MINUS ten degrees, most varieties will not freeze to death. Under normal circumstances, if you raise it at home, you will choose to plant it in the ground. However, if the temperature of the ground plants exceeds minus 10, the branches will freeze to death at the top or the branches will sprout in the next year. However, after germination, these buds are thin and weak, and they are all non-vernalized branches, so the chances of flowering will be very small. So if the temperature is too low, plant it in the garden and protect it in winter, such as putting on a non-woven bag or a plastic bag.
4. Insufficient light
Many people keep hydrangeas indoors. Hydrangea is a light-loving plant, which is more tolerant to shade, so don't put it in dark places, especially in autumn and spring. If there is no light, the branches will be thinner in autumn without aging, and will not bloom the next year. In spring, although the branches are aging, they will not bloom if they are placed in a dark place indoors.
Therefore, ensure sufficient light in spring, summer, autumn and winter, and block 30%-50% when it is hot in summer, so there will be no problem. With sufficient light, the branches will age quickly. Only with sufficient light in spring can the flower buds grow rapidly, and the flower heads with buds will be large.