Posted: 28/12/2013 at 10:16
Hi, pinkquartet....sorry about your techie problems.
To answer your query, I think we need to go back to basics. Sweet peas are very hardy and more are ruined by coddling than neglect. Having said that, there are a couple of things to avoid, one is condensation (that applies to all seedlings though) and icy draughts.
From what you say, I think your aluminium greenhouse would be your best option, but be careful not to site them in the vicinity of the unclosed door.
Remember, they will survive frosts of -10c without any problem, just be careful to keep them on the dry side during very cold weather.