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Scotch Thistle

Scotch Thistle

BACKGROUND: Scotch thistle is native to Europe and eastern Asia. It grows well in waste areas, pastures, rangeland, and along canal and stream banks.

OTHER COMMON NAMES:

DESCRIPTION: This biennial plant commonly grows 3 to 8 feet tall, but it may grow as high as 12 feet. Rosettes may be 4 feet wide. Large, spiny leaves are covered with dense hair, giving a grayish, blue-green coloration. Stems are winged. The flowers are violet to reddish with spine tipped bracts, blooming in mid-summer.

CONTROL: Biocontrol research is currently being conducted. Herbicides can offer good-to-excellent control when applied between rosette and pre-bud stages.

  • SCIENTIFIC NAME: Onopordum acanthium
  • CLASS: 3
  • BIOCONTROL AGENTS AVAILABLE: RESEARCH IS CURRENTLY BEING CONDUCTED

Search for insects

Contact us with questions

Utah Biological Control

Amber Mendenhall

phone: 435 830 4146

email: utahsbuggirl@gmail.com

Utah Noxious Weeds

contact your local County Weed Supervisor

NEW INVADERS GUIDE

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