If the hydrangea has grown too large and there is not enough space for it, then it should be replanted, otherwise you can forget about lush flowering.
In addition, you can replant if the plant does not bloom for a long time.
You can replant hydrangea at any time. But if you need to divide the bush, it is better to do this in the spring so that the plant has time to take root in the summer.
It is better to do this before the buds have swollen, but at the same time positive temperatures should already be established outside.
In the morning or evening the place should be well lit by the sun. But the rest of the time there should be shade. If we are talking about large-leaved hydrangea, it will be able to grow normally even in the shade.
The area must be protected from winds.
You shouldn't plant hydrangea under trees, otherwise there is a risk that the flower will begin to experience a lack of moisture and nutrition.
The soil should be loose and fertile, slightly acidic.