Over-wintering in greenhouse

bullfinch

I am going to keep some cuttings and young plants grown from seed in my unheated greenhouse over the winter. They are all hardy, I know that temperature is not really a problem, I mainly want to protect them from the wet. Last year things which had initially rooted died because of all the rain, when I just left them outside. How frequently should I water them now? Should I keep them fairly dry? I know the Lupins and poppies will die back until spring so I won't be able to tell if they are drooping. Thanks!

AnniD

I would definitely keep them on the dry side. I think the main problem is the moist atmosphere which leads to mouldy leaves. I try and open the door for a while except in the very coldest weather, and wipe down the glass with one of those squidgee things, but you need to keep a close eye on them. 

bullfinch

Thank you @AnniD, yes, there's more than a hint of powdery mildew going on in there 😕 I'd better reduce the watering straight away. I thought it was caused by drying out so I must have overdone it 🙁