A few weeks ago, I saw something at a nursery that looked like some
sort of synthetic mat that you could cut to fit a space and put it down
outdoors to stop plant growth in a specific area. Now I'm trying to
look it up, and I'm failing at Google. "no plant growth mat" "stop
plant growth synthetic" "stop plant grow"

I give up. Anyone know what they're called?

TIA!

--
Jennifer