Dogwood Dilemma
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!

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I would also prune each stem back by half because it's the new stems that give you the bright colours. You can always try taking cuttings with the offcuts.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Yes, I have already had to get some far more biddable perennials out of smaller, similarly-shaped, pots this spring and that was hell's delight. I was thinking I may need a knife! Once it's out, it may want a prune anyway!!