Hopefully, someone else will help you. I grow many different tubers and bulbs and, now, Pleione but I don't grow Bletilla. I am guessing that they are like most bulbs/tubers that awaken after a cold season. Basic advice would be to keep them dormant until they are ready to be planted but to plant them before they have roots (like most other spring bulbs/tubers). If they aren't starting to leave dormancy when you take them from the cold place, you pot them in dry medium and put them in a sunny, warm spot to get them started.
The watering is something that will depend on when they begin growing roots. Some tubers and bulbs are prone to rot when not in a growing stage so this is pretty important. With Pleiones, they often don't start to grow roots until after the blooms are finished but many bulbs and tubers need to develop a good root system before blooming.
Good luck! Hopefully, you will get plenty of good advice now from those who actually grow them.
Threaded Mode
