Description: A native of Europe and is currently used in horticultural planting and dried flower arrangements. Teasel has a stout taproot that may be over two feet deep and 1 inch in diameter at the crown. Plant stems are rigid and can reach heights of up to 6 feet with several rows of downward facing prickles. Adult plants have large, oblong, opposite, sessile leaves that are prickly, especially on the lower midrib. Flowers are small, generally purple, and tightly packed in oval shaped heads. The flowers are subtended by stiff, spiny bracts that are terminally on the flowering stems.
Type: Monocarpic Perennial
Method of Spread: By seed, single plants can produce over 2, 000 seeds and the seeds can remain viable in the soil for up to 2 years.
Habitat and Impacts: Teasel usually grows in open, sunny ares on a range of wet to dry soils. It can usually be found on prairies, savannahs, meadows, and roadsides. Teasel is an aggressive exotic that forms extensive monocultures.
Location: Williams Lake (isolated site)
Mechanical Control: Handpulling small infestations can be effective especially when the plant is dug up before seed is set. Cutting plants near the flowering stage is also effective to stop seed spread.
Chemical Control: Metsulfuron-methyl, aminopyralid, imazapyr, tryclopyr, glyphosate, can all be effective. Chemical treatments are most effective when conducted as the plant is still actively growing and before seed set.
Biological Control: None
CCCIPC Priority and Treatment Strategy: Not prioritized at this time (Fall 2010). CRD crews are actively treating the one known site of it.
Local Level - Handpulling and digging before seed set.
Landscape Level - Herbicide.
Theodore Webster, USDA Agriculture Research Service, Bugwood.org
Barry Rice, sarrancenia.com, Bugwood.org
Invasive species profile taken from the Cariboo Chilcotin Coast Invasive Plant Committee Invasive Plant Regional Strategic Plan
Page last modified: March 15, 2017 09:36:29 PDT