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JoAnne Skelly: Stop yellow starthistle from spreading


I have been seeing a nasty noxious (that means it’s against the law) weed in bloom recently, yellow starthistle (YST).
It is a 2- to 4-foot-tall gray-green plant covered in whitish hairs with wicked ½- to 1-inch spines at the base of each yellow flower. This annual weed sprouts, grows, blooms, produces seed and dies in one year. Despite its short life, it is remarkably invasive. It is highly competitive and often develops impenetrable stands, displacing desirable vegetation. YST is a prolific seed producer, with a single flower producing 30 to 80 seeds. It flowers until frosts kill it. A large plant with many blooms can produce thousands of seeds that can remain viable in the soil for up to 10 years. At maturity it has a deep taproot, up to 6-feet long, which enables it to access soil moisture most other annuals can’t reach. ....

Melody Hefner , மெல்லிசை ஹெஃப்னர் ,