Posted: 04/03/2013 at 16:59
I have had enough problems tripping over a bag of soil in mine today.
I dont use heating at all, but I do have a conservatory that plants go in for the winter.
I have over wintered pixie lupins,big lupins, sweet peas, campanula, fuchias, geraniums, lots of trailing green/white stuff, lots of other things, all in an unheated bubble wrapped greenhouse.
I think its probably best not to start your seeds off to early, they will then be ok in the greenhouse, although I still havent put my tomato's out there yet.