I took cuttings from salvia hot lips, penstemon, fascias and saponaria ocymoides on 31st August. Most have taken well and have a good or developing root system. I potted them on 2 weeks ago and they are still in my green house. Should I leave them there where greenfly like to overwinter, or put them in a cold frame and protect them only really cold spells? I'm so excited that the cuttings have taken and don't want to lose them.