Nurseries and retail centers in Marin County are now prohibited from selling tropical milkweed, a variety not native to the area and harmful to monarch butterflies.
Marin County Agricultural Commissioner Stefan Parnay issued a memo to the local retail centers Aug. 24 to prohibit the sales of the non-native plants on the heels of the California Department of Food and Agriculture designating tropical milkweed as a B-rated weed. Such weeds are rated as pests that do not meet state cleanliness standards.
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