If it is not controlled all your fine, soft grass will be choked out by the sharp-edged, rough, ugly crab grass. It will run roughshod over your flowerbeds, your lawn, and as Sparrow mentioned, try to take over such places as your porch or patios. It is not to be tolerated in the yard or garden. It is to be terminated on sight.
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"If you want yor children to be bright, read them fairytales-- if you want them to be brilliant, read them even more fairytales" Albert Einstein