Plants for a Future Database: Aesculus parviflora - Seed - best sown outdoors or in a cold frame as soon as it is ripe. The seed germinates almost immediately and must be given protection from severe weather. The seed has a very limited viability and must not be allowed to dry out. Stored seed should be soaked for 24 hours prior to sowing and even after this may still not be viable. It is best to sow the seed with its 'scar' downwards. If sowing the seed in a cold frame, pot up the seedlings in early spring and plant them out into their permanent positions in summer.

Thank you. I guess I'll keep the pots in the unheated GH. It's not warm but remains above freezing.

I harvested some seeds this fall, mixed them with some moist sand and refrigerated. they've sprouted now and I am wondering if I should put them in the ground now or wait to pot up in the spring (Z4b-5a)