Not growing very much - I don't think they've changed in size since I last saw them (three weeks ago or so). The greenhouse they're in is not heated, so this may be the problem. They have plenty of water (the muddy roots of the weeds I pulled proved this). I will leave them for another week or so because the weather is supposed to be warming up, and then if there is no change I think I will dig them up, pot them up and bring them home to live in my bedroom (south facing window and all that jazz) :-)
To be honest, I'm just glad they're still growing/still there..!