Posted: 22/07/2015 at 17:34
They're happier in the ground arthur, as they can access nutrients and water more easily, so if you keep it in a pot, you'll have to make sure it's big enough and that you change the compost/soil each year, otherwise the pot will be full of roots and not much else. Think it's a Group 2 - so light pruning. You can prune it back a bit now if it's finished flowering, (it'll flower again later this year) and then in late winter/early spring to keep it to a manageable size and give it the best chance of performing well.
I'd get it into a bigger pot though. That will help with nutrition. Then keep it well fed and watered