I got this Cornus Sibirica early last summer. I have a large roof terrace where I can only have pots. I'd told myself that a Cornus wouldn't be suitable, but I saw one at at home/garden store that had been reduced to £3 so I thought, 'what have I got to lose'? It was sickly at first but it came right in the end. Consequently I've grown quite attached to it. (Last summer was my first year gardening.) Anyway, I decided to wait until next spring (2021) before pruning it back hard. I had thought I might leave it in this pot til then too. Now I'm concerned that its roots might struggle through another summer in this pot, however much I water it. However, it's put out so many leaves so early, I'm not sure if I've missed my chance. Is this so? Should I re-pot it now? Thank you!