CANADA THISTLE
(Cirsium arvense L.)

GROWTH HABIT: Perennial, erect, up to 4' tall.

LEAVES: Varies from light to dark green, oblong or lance shaped, deeply cut, spiny toothed margins (some may be smooth); slightly hairy below. Tremendous leaf variability.

STEMS:
Smooth to slightly hairy, branched at top.

FLOWER: Small bristly clusters, 3/8 to 5/8 inch in diameter, light lavender to deep rose purple. Plants are male or female.

ROOTS:
Extensive, fleshy, creeping rootstocks.

SEEDS:
Smooth, light to dark brown, tipped by a cupped conical point, approx. 1/8" long.

OTHER:
Reproduces by seed and creeping rootstocks.

[ Weed Photos] [ Weed Index] [ Still have Questions] [ Related Web Sites]  [ Weeds of the West]