Growing pumpkins in area filled with weeds you can’t get rid of?
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Here is what you can try. Dig out and clear as much as you can. Cover the entire area with newspaper, cardboard or landscape fabric. Then cut a hole for each pumpkin plant or seed, giving each one enough "breathing room" to grow properly. Then cover the area with mulch.
Mulch the area with layers of newspaper or use straw (not hay).
I would do as Naomie suggested. While the covered area is killing the weeds, you can plant your pumpkins and have a crop right on top of it. I use about a quarter of my garden for winter squash, if the weeds are too bad this year in that area, I may do that myself. I plan to put my tomatoes in that area this year and put the squash where the tomatoes were. It was very hard to weed under the squash vines because they are so prickly, so Creeping Charley really creeped in.
Lay down layers of newspaper between & around your plants. Hold them down with a thick layer of mulch or compost. Weeds underneath should die as the pumpkins ramble over the top