Posted: 28/11/2012 at 09:54
All clematis require a lot of food to produce decent flowers so, if they're in pots, you need to make sure they get a liquid feed every week through the growing and flowering season. This summer, having been so cool and damp and grey ahs not been the best for the large flowered wlematis to perform.
My clemati ssupplier reckons Florida Sieboldii is hardy to -10C but I had one killed off by less than that. In a pot it will be even more vulnerable so should be stored in a sheltered spot and have the pot, but not the plant, wrapped in bubble wrap to give extra protection to the roots.