keep Crocosmia and Schizostylus in pots
I've got a Schizostylus coccinea ‘major’ and a small Crocosmia that are currently in a herbaceous border. The Schizostylus has just started flowering, and the Crocosmia is slowing down. They need to be dug up and kept in pots for quite a while during garden restoration. Possibly for a year. I'm looking for some advice about what kind of growing medium to use and how much room the rhizomes should have in the pots to give them the best chance of surviving. Also, should I cut them both back? I have a poly tunnel and could also give them protection outside from our strong winds in shade. Protection in sun is tricky, but if essential, I could make a sheltered enclosure from old polytunnel plastic. Thank you
Carmarthenshire (mild, wet, windy). Loam over shale, very slightly sloping, so free draining. Mildly acidic or neutral.