Can someone advise on treatment of Begonia grandis subsp. evansiana propagules. Do I "sow" now or spring or store, how, how deep etc. If I had not gone to a meeting last week on Gesneriads, some of which produce numerous propagules, I would not have recognised them for what they are. Found them falling on a pot of Anemones pavonina trying to flower. I guess these are aerial bulbs? Brian Whyer, Buckinghamshire, England, zone ~8 ish