30 per cent vinegar diluted with water for a 50/50 mix with some dish soap, no salt. I am a gardener and the rocks heat up in the sun and can damage the roots and dirt accumulates between the rocks and the weeds will grow. The mats do not allow water to get to the roots properly and that includes fertilizer. I have a large garden and am out there almost every day. Every box or bag of weeds is a battle won but, if you think you can win the war, you are mistaken, but I do love my coreopsis, milkweed and echinacea and all the bees and butterflies they bring.
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