Lavatera olbia ‘Rosea’ will thank you if you give her some fertilizer regularly. When a cold period arrives, it is best to protect ‘olbia Rosea’ by covering it, for example with pine branches or a layer of leaves.

As for pruning, at the beginning of winter you can prune the bush back to about 50 cm above the first buds. If you prefer to prune in early spring, you can update the shape of the shrub. Then leave two or three buds at the base of the new shoots. This will give you a more compact shape.

General care tips can be found here