Hi there, thanks for the reply Philippa. I thought that going to a large pot from smaller pots was best, they werent exactly root bound but they did have a nice structure when I replanted them, I hadnt realised it was a negative to go large straight away and I was thinking that I have 6 or 7 months for them to grow anyway now, and the odd Hab is thriving in a large pot... They were all sown in a heated propagator and then replanted soon after the seed leafs appeared in to 2 inch pots, they sat on my window sill in the kitchen for a month or so until 4 true leaves had appeared on each plant then I took them down to my garden and put them in my green house then replanted them about a week later after theyd acclimatised a bit, and that was about 3 weeks ago. This is just something that has appeared to have started to happen within the last few days, like say, a week if that. I have been checking all the plants for the normal nastys, aphids etc and they all seem in perfect condition in that respect no infestations at all and prior to this they all seemed to be growing pretty well at a steady and noticeable pace.