LIke the video says, cardboard is a Temporary, non poisonous layer. Weed seeds sit under the surface. When somebody tills up the soil, they pull up the weed seeds, the soil fragments and pools together becoming less friable and you get a weed explosion. MY weed problems are different mostly bc of burdock, brought TO my property BY my horses and me, involuntarily.
I Hope to kill off burdock in the South Pasture in 2026, by covering with cardboard, then move recent compost with my tractor to cover.
Fortunately most vendors are shipping with non color printed cardboard, just black print. You should pull the packaging tape. It won't decompose and you will just have to pick it up to throw away later.
ASK me how I know this!
I got a 3rd cutting of hay this last year, which means each bale is full of hay seeds bc the grasses went to seed before harvesting. Burdock is stubborn. I laid cardboard down last Fall over a patch and a fenceline that had 2025 burdock and leftover seeds, when my DD was helping me strip stalls, and we dumped on top of the cardboard.
I plan to repeat this under my other fencelines that have had burdock problems, too.
I know I have a lot going on and many things to fix around the property. One of them is my manger in the horse shelter. Wicked ponies broke 1/2 of it and I have been putting most of their hay outside on the ground All winter. There will be a lot of hay/grass growing where I fed them. Not a bad thing.
However, I will have to clean up my training area (55' x 65') bc it needs to be clay, or else they will slip in there under saddle. Good thing I have a tractor! I should be able to pull, then pick up, then move the decomposing hay, again full of hay seeds, to put on top of the cardboard and burdock/seeds.
Nothing is perfect. I expect better pastures this year.