cabbage plants

i got a few cabbage plant some weeks ago,they did'nt look to smart i was not sure if they'd 'take' so i just put them in together in a small corner..but they have came on great but are close together can they be moved ok?and how far apart do they need to be??(i don't have a lot of room) :cry:

oh i can't remember,got them in a market for a few bob not much to look at,and they were in a bucket for a few weeks before i put them out as i thought they were done,what is the minimum they will need between them to grow on??

thanks wg