Weed Control

SDSU Cooperative Extension Service

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plant

Life cycle: Local noxious. Biennial or short-lived perennial.

Leaves: Alternate, deeply divided into narrow segments. Much smaller near top.

Stems: 1 to 3 feet tall, hairy branched.

Flowers: About ¾ inch across, pink to purple, dark spots on flower bracts.

Roots: Biennial taproot. Forms rosette first season.

Weed Species: local noxious weed

Comments: Diffuse knapweed similar, but lacks dark spots on flower bracts.