If you want a big bush, prune lightly in early spring or in the autumn after flowering, just removing the wilted flowers; this gives smaller flowers but encourages growth. For larger flowers, prune more strongly, e.g., half the annual growth.
When young, water regularly and do not let dry out. Older plants only need extra water in very dry conditions (such as the summer of 2018).
The best time to move it is in the autumn after the leaves have fallen.
(More info in Finnish)
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