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Parrot's Feather

A popular aquatic garden plant that spreads with water currents, animals, boats/trailers and fishing gear. Dense stands can stagnate water, and increase breeding grounds for mosquitoes learn more »

Zebra/Quagga Mussels

These tiny freshwater mussels clog drains, damage infrastructure, and are very costly to control/eradicate learn more »

Giant Hogweed

A towering toxic invasive plant with WorkSafe BC regulations learn more »

European Fire Ant

A tiny ant with a toxic sting learn more »

Purple Loosestrife

An aggressive wetland invader that threatens plant and animal diversity learn more »

Orange Hawkweed

Also yellow, these invasive plants replace native vegetation along roadsides, and threaten areas not yet reforested learn more »

Japanese Knotweed

Grows aggressively through concrete, impacting roads and house foundations learn more »

Spotted Knapweed

A single plant spreads rapidly with up to 140,000 seeds per square metre learn more »

Scotch Broom

An evergreen shrub that invades rangelands, replaces forage plants, causes allergies in people, and is a serious competitor to conifer seedlings learn more »

Teasel - “Alert” Species

Species
Dipsacus fullonum

Teasel (Dipsacus fullonum) is a biennial or sometimes a perennial weed that prefers open, sunny areas, and will tolerate a range of wet to dry conditions. It is found in pastures, meadows, disturbed areas and along roadsides. Teasel is too prickly and bitter to be eaten by wildlife or livestock, reducing available forage and out-competing native vegetation. 

Teasel has prickly, highly branched stems that support bristly, egg-shaped purple to white flowers. Flowers bloom in rows starting from the middle of the flower head. It has a strong taproot, and grows up to 7 feet tall. Though plants typically die after flowering the first time, it spreads successfully by seed. A single plant can produce more than 2,000 seeds, with 30-80 per cent germination success the following spring. Seeds can remain viable for at least two years.

Teasel was used in wool "fleecing" (raising the nap on woolen cloth), making it a valued horticulture plant that led to its introduction in North American as early as the 1700s. It escaped cultivation and is spreading rapidly throughout the U.S. except in the northern Great Plains.  

Gallery: Teasel