If you are going to use this then I suggest you use it as a mulch on top of the ground and weighted at the edges with a little soil or something heavy. Lay it down and then cut slits for planting.

Putting any barrier under the soil does nothing to stop weeds from growing on top of it and it is a pain to remove when it gets rotten or has holes.

Regardless of how you use it it will have to be split in an X and the plant set in the hole, to allow anything to grow.

Personally I would never use the stuff

I admit I don't understand the purpose of the question. I don't understand why plants wouldn't grow with such a petrochemical layer on top of the soil. The issue is the absorbed heat at the product surface and what plants will react unfavorably to their parts touching a dark surface on hot days, which is almost all of them. That is: many mo' bettah consumer products than those.

Dan

Physical weed barriers are a great way to show people how nasty and powerful nutsedge is. hehe...

Hopefully you don't have to deal with this weed where you're at. I'm pretty sure it could sprout through 5" of titanium encrusted concrete after a couple months of warmth.