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Weed of the Week
Weed of the Week
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Oxeye Daisy (Chrysanthemum Leucanthemum) & Scentless Chamomile (Matricaria Perforata)
Posted on November 10, 2014 at 3:32 PM by Tim Weideman
Don’t Be Fooled!
Many of those perky white daises are invaders, not native wild flowers. While there are native white daisies in Colorado, the most common ones you will find this summer are actually Noxious Weeds. Oxeye Daisy and Scentless Chamomile were introduced as ornamentals but have escaped cultivation and are now moving into native habitats. These aggressive invaders displace important wildlife forage, reduce available habitat, and disrupt the delicate balance of riparian ecosystems.
Oxeye Daisy (Chrysanthemum Leucanthemum)
Oxeye Daisy grows as an erect perennial with a fibrous root system. Showy white blossoms have yellow centers. Lower leaves are spoon-shaped and appear somewhat waxy; upper leaves are narrow, deeply lobed, and clasp the stem. Oxeye Daisy is often confused with the non-noxious ornamental Shasta Daisy. However, Shasta Daisy leaves are much larger and are not lobed but have serrate edges.
Scentless Chamomile (Matricaria Perforata)
Scentless chamomile is an annual that grows .5-foot to 2-feet tall in a bushy shape with showy white daisy flowers. It is nearly identical in appearance to the variety used for tea, but can be easily distinguished by its lack of odor. Scentless chamomile has no forage value and can cause blistering of muzzles, irritation of mucous membranes, and skin rashes in livestock and wildlife. A single plant can produce as many as a million seeds.
These are just 2 of several Escaped Ornamentals now invading the Roaring Fork Valley. To learn more about invasive ornamentals, please attend Pitkin County’s annual Ornamental Weed Tour in Snowmass Village on July 8 from 9 a.m. - Noon. The event is free and lunch will be provided. RSVP by
emailing Crystal Yates
or calling 970-920-5214.
Pitkin County is offering $20 coupon to Crystal Gardens or Planted Earth, in exchange for a 13-gallon trash bag full of certain noxious ornamental weeds. Qualifying weeds include Oxeye Daisy, Dame’s Rocket, Scentless Chamomile, Absinthe Wormwood, Myrtle Spurge, and Houndstongue. Limit 2 per person. Pitkin County residents only. Bring your 13-gallon trash bag full to the Pitkin County Landfill to exchange for your coupon.
Garfield County, in cooperation with the local Conservation Districts, and Pitkin County both offer cost-share programs that provide financial assistance to landowners for noxious weed management.
For additional information:
Email Garfield County
or call 970-625-8601, ext. 105
Email Pitkin County
or call 970-920-5214
Email the City of Aspen
or call 970-429-2026
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