GROWTH HABIT: Biennial, reproducing by seed only. Rosette formed 1st year, flowering stalk elongates 2nd year.
LEAVES: hairy, alternate; BASAL - large, heart-shaped, rhubarb like; UPPER - more oval shaped. Dull green above, greyish underneath.
STEMS: Rough, hairy, somewhat grooved, often grows over 5 ft. Tall.
FLOWERS: Numerous, to 1" broad, clustered, purple, seedheads covered with hooked spines, forming a bur a maturity.
ROOTS: Large fleshy taproot.
SEEDS: Rough, mottled brown, somewhat flattened, slightly ridged.
OTHER: Common burdock thrives in shade and most fertile soils.