International directory enquiries <a href=" http://www.balanceability.com/buy-promethazine-dm-syrup.pdf ">buy promethazine dm syrup</a> Though a mini greenhouse gives you the option of overwintering taller plants, there is no reason why you couldn't try this with a cold frame just outside the back door. But avoid plastic temporary structures if you are putting in a heating mat: they are just too draughty to make this efficient. During particularly cold spells, I threw an old blanket over the whole thing, to seal it up and hold in the heat, and this would work well over a cold frame too.