Thanks, Cheryl. I think I'll wait until next spring to re-pot/soil my BFs. I am not sure how many ferns will remain of life then. Probably a lot less than when bought, so probably don't need bigger pots (they came 10" hanging pots). But the details of screening out good, live fern/root remain unclear to me. I'll tree-mail you with all questions when time comes if you kindly allow me. I am glad and feel lucky I find help here.
