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Monty said to make sure the bog roll is well and truly wet you plant it. then it'll rot.I really must sow mine soon!
They can be planted out anytime from now on. But as they have been in the nice cosy environment of your spare bedroom they need to be hardened off first before you plant them out. In other words you need to acclimatise the plants to the outside conditions. You need to do this gradually over a period of days. Increasing the time exposed to the outside conditions each day.Ideally this should be in a cold frame. If you havent got a cold frame then I would guess it would have to be in a relatively sheltered place. Gale force winds like last weekend will demolish the plants pretty quickly. All you are trying to achieve is to not make it too much of a shock to the plant when it is planted in its final place.
Do watch out for frost even with your plastic greenhouse. I have one and it doesn't seem to protect against frost. I've covered it in fleece to keep my seedlings cosy.