Yep, that's what I meant. Sorry I wasn't clear.
If you cover nursery pots with a tarp, pull it tight and secure it well to keep it off the soil surface. Rain and snow can crush it down and your seeds stick to the tarp, or after germination, the seedlings are squished. One of the many things I like about milk jugs- a nice, secure rigid roof which doesn't collapse. And headroom for seedlings.
Karen
