I repotted my C. ovata in mainly akadama. It fared much better this winter than in the previous years.
I took it outside a couple of weeks ago (very mild weather here, even unusually hot : 29°C on Tuesday!), and pruned it :
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Perhaps I should have been bolder, and prune it back harder, but to be on the safe side, I decided to keep two leaves on each twig. It's been very hot here for the season, and I put it in full sun. If more light through the branches induces lower buds, I might prune it harder...