Sorry, I should have made myself clear. I very much appreciate the feedback. Especially that at odds with my advice. I've done a lot of reading, have nearly three decades growing the sacred herb, and over fifty growing a vegetable garden. I learn something new, every day.
I strive to give the best and most accurate help I can. I've had a lot of help in my life. This is one way I try to give a little back.
Please let me know how those plants fare. I think they'll be fine, but in the name of science, I'd love to see pix of two plants side by side in your garden. Plastic/No plastic, and see how they'd compare. I'd suggest you mulch the one without plastic. Mulching is the best way to conserve water, I know of.