I tend to wait until just before bud burst. It can be frustrating to watch a tree as the buds swell, then a period of freezing weather comes along and halts potting progress. Things like Monterrey Cypress can be potted a lot earlier than most conifers. Even here in the UK they visibly grow over the winter and begin to speed up from the end of January.
@Bonsai_Bentley I would check the soil before you plant the Chocolate Mimosa. As I understand it, Magnolia like acidic soil whereas Mimosa likes alkaline. Just a thought…
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