Can you get the pesticide out of milkweed that's been treated for pests? Worried about the Monarchs.
Md Ariful Islam
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Dr. Md Rushad Rahman
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Once milkweed has been treated with pesticide, it becomes toxic to insects, including the Monarch caterpillars that use it as a food source. The pesticide needs time to dissipate, usually months, during which time the plant either needs to be covered with netting or similar, or if in a pot, moved indoors so that Monarch butterflies will not try to lay their eggs on it. Remove caterpillars already on it and place them on safe foliage; they may or may not survive but at least you're given them a chance.
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