Baby clematis: Plant out or mature in pot and a few other questions
Hello everybody, I am new to gardening and this is my very first question on this forum. My situation: Around 2-3 weeks ago (can’t remember) I bought two baby clematis in 9 cm pots (Nelly Moser, Group 2, Comtesse de Bouchard, Group 3) and had already dug out one spot for one of them thinking they should be planted out as soon as possible. Then I came across advice that it is better to keep them in a pot for one season (or maybe more?) to let them mature and develop a good root system first. This made complete sense to me so I put both of them both in their own pot planning to cut them down to 30 cm (?) in the end of February next year and then plant them out in the garden. My dilemma now is that they have already grown to over a metre and I don’t know how to support them in the pot till spring at this rate. I know I should have some kind of trellis but all I can find online are obelisks which are too wide on the bottom and don’t fit in the pot so at the moment they are growing straight up on the canes but at this speed they reach the sky soon...Am I not able to prune them back at all before spring? Would I need to bring them inside coming winter or would they survive outside (Maybe trying to insulate the pots with a sleeve)? We have a narrow but tall unused trellis fixed on the wall of the house (west facing) but if I let them go wild on that one I would not be able to move the pots anymore in case of frost. I am panicking a bit and toying now with the idea of getting them into the ground as soon as possible but doubt I get them out of their pots without causing a lot of damage to them as they are now wrapped around the canes and look incredibly fragile. Any suggestions are gratefully received!