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Canada
Thistle (Cirsium arvense
L.)
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Growth
Habit:
Perennial, erect, up to 4’ tall.
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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.
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Stems: Smooth to slightly hairy,
branched at top
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Flower: Small bristly clusters,
3/8 to 5/8 inch diameter,
Light lavender to deep rose purple. Plants are
male
or female.
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Roots: Extensive, fleshy, creeping
rootstocks.
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Seeds: Smooth, light to dark brown,
tipped by a
Cupped
conical point, approx. ⅛” long.
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Other: Reproduces by seed and creeping
rootstocks.
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