Killing Weeds Before Putting in a Raised Vegetable Bed

I'm putting in a raised vegetable planting bed over a rocky area infested with invasive morning glory and large-form periwinkle roots. We have dug, pulled roots, and sifted the soil and after a 2 week period covered with tarps, found vigorous morning glory growth possibly from seeds. 1) How long does the plant killing action of vinegar last? 2) Will vinegar kill growth if it is under old carpet, then 18 inches of new topsoil? 3) Is there any other control method that works? Thank you for this?

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May 4, 20190 found this helpful

I have had raised beds for many years. Although the Square Foot Gardening book promises no weeding, I have not found this to be so. I pull manually, especially with invasive specials such as morning glory and raspberries. Vinegar kills everything, so dont use it. Once the plants you want have taken and are doing well, you will find you have to weed less. Mulching helps, too.

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