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Probably not, but some grasses have a waxy coating which the soap may temporarily strip off. (This changes the color, but shouldn't cause lasting harm if you stop after one treatment.) Try not to spray it on nearby plants, since soap can damage nasturtiums, geraniums, violets, peas, pine, and cherry trees, among others. Insecticidal soap from a garden store is less likely to cause harm than a homemade treatment.

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