If you've ever made your own cold-frame, how did you weight it down?
Yes and I've got cats that will be investigating it. Might have to chops up a bit of my neighbors thorny blackberry bush to put them off sitting on it. Or maybe use some of the metal bars from the old poly tunnel... Times like this I really hate having pets. Later in the year when they're squatting cabbage whites out the air I'll love them again.