To help kill that grass that keeps cropping up in between the cracks on your patio and sidewalks use salt. Salt makes a great natural herbicide. All you have to do is carefully pour salt into the cracks, followed by some water to keep the salt from blowing away. It is that easy.
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I have heard that the extra salt in the soil holds onto heavy metals and increases their concentration in the soil. So we need to weigh the pros and cons… I guess that if it is just between the cracks in the concrete, then it wouldn’t be a problem. Another eco-friendly herbicide is flat Coke.