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Don't Be Fooled By These Pretty Purple Flowers By Learning To Identify Invasive WeedsSpotted knapweed (Centaurea maculosa ... Between July and September, it puts on a rogue show of thistle-shaped purple flowers that bob over black-mottled bracts — hence the name.
According to MDA Plant Protection Director Geir Friisoe, spotted knapweed is an aggressive, fast-growing weed that can displace beneficial plants. It is considered a threat to agriculture and the ...
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