I built myself a new little plastic "greenhouse". Nailed a framework together out of scrap wood
and then stretched some plastic (from the mattress store- thanks for the idea, Mom!) over it, fastened with staples.
The young tomato and basil plants look marvelous in there.
It wasn't easy to do. I'm no carpenter and my design wasn't very good; I had to start over a few times. Nails didn't hold well so then I put it together with wood screws. It's uneven and leans a bit but holds together fine, looks way better than my old one!