I have just taken up my onions from the vege patch and have a nice big space that I thought I could use for garlic that we have had delivered at the garden centre. The instructions say that they should be planted in August/September but nothing on when they will be ready for harvest. I don't want to use ground that will delay my growing next year - also I am not convinced they can grow over the winter that we have here, it goes down to -18 and usually about a meter of snow over the vege plot - what do you thik?>