Hello Headfry. Thanks for reply. Hornchurch in Essex. Sacks are just old compost sacks turned inside out so black on the outside. Trying to keep the garden a bit tidy as they are sitting among my husbands shrubby border. I am actually growing them in soil. Look very healthy at the moment and I haven't gone too mad with the watering despite the fact that we have just had a long very hot dry spell. Suddenly thought when I saw the replies to M&mbm that the bags might get a bit humid. I do have the tops open though. Ah well, all life is a gamble eh? I'll just have to see what happens. I have just asked my OH if he minds if I plant my purple sprouting broccoli in the flower bed outside the conservatory as I have run out of room in my veggie patch.Bless him, he doesn't mind in the least and wondered why I thought he would!!. Sanjo