Broadleaf Weed – Canada Thistle

(Cirsium arvense)

Canada Thistle, also referred to as Carduus arvensis, Creeping Thistle, Small-flowered Thistle, Perennial Thistle and Green Thistle – is a perennial broadleaf weed. Cirsium arvense thrives in crop fields, abandoned fields, poorly maintained lawns, prairies, meadows, vacant lots, and along roads and railroads. Because of its aggressive nature, it can also invade lawns and gardens. Canada Thistle can be found throughout much of the eastern and Midwestern United States.

Identifying Canada Thistle -

Canada Thistle can be identified as a spreading, upright perennial. Its leaves are conspicuously lobed with spiny margins. The stems are grooved, smooth to slightly hairy, and vertically branched at the apex. The base of each leaf surrounds the stem. Roots and rhizomes can extend more than a meter underground.

Blooming from early to mid-summer, Canada Thistle features several flower-heads to each stem, each composed of many disk florets that are dull-pink to purple in color and sweet in fragrance. Reproduction is by wind-blown seed and creeping rhizomes.

Canada Thistle Control -

Canada Thistle can be an extremely aggressive broadleaf weed, quickly taking over un-mowed lawns. Lawns that are properly maintained through proper lawn mowing, watering and other cultural weed control practices are vulnerable to the spreading affects of this lawn pest.

Canada Thistle - Broadleaf Weed

Scotts LawnService recommends a selective systemic weed control program to fight Canada Thistle in your lawn, which ensures the herbicide is moved throughout the weed, killing it completely root and all.

Scotts LawnService is the trusted industry leader for professional quality lawn care. Our exclusive lawn care products include premium grass seeds and professional-grade fertilizers; our lawn service teams are made up of highly trained, industry-certified professionals. Contact a representative today for Canada Thistle control options available in your area and to learn how you can enjoy a lush, fuller lawn that only Scotts LawnService can deliver.