Mulch won't stop weeds completely. Applied deep enough, it will prevent many weed seeds already in the soil from germinating and growing. But it won't stop weeds that have already rooted. Tough weeds like dandelions will push right through if you don't dig them out first. And more weed seeds will blow in and take root in the mulch (in both organic and stone). All mulch-covered gardens require maintenance, though less than if you don't use mulch.
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