(Phew, you even have a place for the really stupid questions!)
I sowed Tagetes and lettuce in January and they're big enough now to pot on. I've put the lettuce in bigger pots but how long before I can start to harden off and plant out? I don't have a coldframe as such but I make do with some see-through sturdy storage boxes on a warm south facing balcony. Can I put them out in that now? ???