Blooming Biennials! Musk Thistle

Identification

Biennial, large purple flower, flowering in early June. Flower heads are solitary and usually nodding. Height 3 to 6 feet.

Economics

An aggressive plant spreads rapidly to form dense stand, often displacing desirable forages and grasses. Found in pasture, range and timber lands.

Chemical Control

Easy to control in first year of growth (seedling, rosette stage). Fall or early spring applications can be made. Several selective herbicides are available. Call your local weed control supervisor, or chemical consultant for specific recommendations.

Biological Control

Seedhead weevils are widely established, and may be beneficial on large acreage sites.

Was this page helpful?

Related Content from OSU Extension

Ask an Expert

Have a Question? Ask an Expert!

Ask an Expert is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.

Ask Us a Question