I have two lovely Parmas... Duchesse de Parme and Comte de Brazza. Both flowered quite heavily this past winter. I recently cut back all their ratty foliage, and have now moved them outdoors with the onset of warmer weather. They are sending out all sorts of healthy new growth. Is it necessary for me to divide the plants and repot... Or can I just leave them as they are? Neither one has quite filled their pot as of yet. I had read on various web sites that it was necessary to divide Parmas to keep them flowering well. Please advise.