I’ve been collecting Bald Cypress in the Fall/Winter in Texas for many years with a pretty good success rate>95%.
So if collecting in Fall/Winter is THE time to collect, why not re-pot established bonsai (read; bald cypress) during to same time frame?
I hear you can’t do that cause the roots freeze! Well, the BC roots freeze while growing along the river, too!
The best time to plant a garden tree is the FALL so roots get established. I’m thinking it’s the same for my trees.
I re-potted a large BC over the weekend, and my bet is that it will be just fine come Spring.