Download common burdock - Park County Weed and Pest

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COMMON BURDOCK
(Arctium minus)
GROWTH HABIT: Biennial, reproducing by
seed only. Rosette formed first year,
flowering stalk elongates second year.
LEAVES: Hairy, alternate; basal leaves large,
heart-shaped, rhubarb like; upper leaves
more oval shaped, dull green above, grayish
underneath.
STEMS: Rough, hairy, somewhat grooved,
often grow over 5 feet tall.
FLOWERS: Numerous, broad, clustered,
purple, seed heads covered with hooked
spines, forming a bur at maturity.
ROOTS: Large fleshy taproot.
SEEDS: Rough, mottled brown, somewhat
flattened, slightly ridged.
OTHER: Thrives in shade and most fertile
soils.
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