broadleaf weed · perennial
Cirsium arvense
Spiky, deeply-lobed purple leaves with prickly margins and purple-pink thistle flowers; grows 2–4 feet tall.
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Canada thistle has an extensive root system — digging usually fails because any root fragment left behind regrows. Spray with triclopyr or glyphosate (spot-treat) for best results. Wear thick gloves due to spines.
Spot-treat with glyphosate when actively growing in spring or early summer, or use a strong broadleaf herbicide (2,4-D + dicamba or triclopyr) in fall. Repeat as needed.
Remove flowers before they set seed; maintain turf density to prevent thistle establishment.
Remove flowers before they set seed; maintain turf density to prevent thistle establishment.
BioAdvanced All-In-One Weed & Feed (22-0-4)
Scotts Turf Builder Southern Triple Action
Scotts Turf Builder Southern Triple Action
Scotts Turf Builder Triple Action1
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Measure my lawn — it's free →Spiky, deeply-lobed purple leaves with prickly margins and purple-pink thistle flowers; grows 2–4 feet tall.
Herbicide spray. Canada thistle has an extensive root system — digging usually fails because any root fragment left behind regrows. Spray with triclopyr or glyphosate (spot-treat) for best results. Wear thick gloves due to spines.
Thistle (Canada and Bull) is rated hard to control. It usually requires multiple applications and a consistent plan.
Remove flowers before they set seed; maintain turf density to prevent thistle establishment.