When Does Seed Set Take Place in Musk Thistle?

Musk thistle (Carduus nutans), a biennial, sets seed in its second year. First year seedlings emerge as spring or fall rosettes that overwinter. Second year plants produce shoots--stems--between March and May, setting seed 45 to 55 days after the shoots first emerge. Plants then die.

Keywords: musk thistle seed, biennial seed set, carduus nutans

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A freelance writer, Judy Wolfe has owned Prose for the Pros, a freelance writing business, since 2006. She's been an inveterate traveler since 1961 and draws on her travel experiences to provide articles for such websites as Chincoteague Island Vacations and Berlin Dude. Wolfe holds a Bachelor of Arts in literature from California State University at Pomona.