Dipsacus fullonum L.
Common teasel, a native to Europe, was introduced to the U.S. through contaminated seed sometime in the 1700’s. It is a tap-rooted biennial that commonly grows 6 feet tall. It has small, sharp spines on its stems and under the midrib of its long leaves. The flowers are light purple and occur in dense, protected clusters, which often grow 2 inches or longer.
Common teasel spreads through prolific seed production, compounded with its high seed germination potential. This plant is seen as a major threat to waterways because its spiny nature reduces accessibility to humans, wildlife, and domestic animals. Found throughout the U.S., it is currently noxious in four states. Because this plant has been confirmed with a very limited presence in Teton County, it is considered a very high priority.
If you find this weed on your property or around Teton County, please report it immediately at 733-8419.
© John M. Randall/ The Nature Conservancy