April

Purple to Pink Flowers

Redstem Filaree

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  • Annual or biennial spreads from rosette.
  • Stems 1 inch to 2 feet long.
  • Frut is spiked and multi-headed.
  • Leaves are feathery and deeply lobed.
  • Remove prior to seed set by pulling or hoeing.

Yellow Flowers

Flixweed

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  • Winter annual that blooms early in spring.
  • Grows 8-24 inches tall.
  • Plants are bushy.
  • Leaves are feathery and deeply lobed.
  • Small, four-petaled yellow flowers.
  • Common in disturbed sites.
  • Remove prior to seed set by pulling or hoeing.

Bur Buttercup

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  • Annual that hugs the ground (2-5 inches tall).
  • Grayish-green leaves are deeply lobed and finger-like.
  • Five-petaled, small yellow flower.
  • Sharp burr-like seed (up to 1 inch long).
  • Remove prior to seed set by pulling, hoeing or mowing.
  • Highly toxic to sheep.

White Flowers

Hoary Cress

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  • A perennial that spreads by roots and seeds
  • Grows up to 2 feet tall
  • Produces white flower clusters with flat tops in May
  • Leaves are lance-shaped and bluish-green
  • Grows in meadows, fields, roadsides, ditches, streams, and rangelands as well as garden sites
  • Mow two to three times per year at the bud stage to slow spread
  • Do NOT pull, as plants will grow from root fragments
  • Chemical controls are available

Grasses

Cheatgrass

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  • Winter annual that grows 4 to 30 inches tall
  • Seed stem is skinny and droops like a shepherd’s crook
  • Green in spring, fades to reddish-purple by early summer, and then tan by mid- to late summer
  • Acute fire danger
  • Remove prior to seed set by pulling, hoeing or mowing
  • Common in disturbed sites
  • Herbicides are available for larger infestations