Yellow alyssum (19770 bytes)

Yellow Alyssum: Alyssum alyssoides

Yellow Alyssum is a member of the mustard family. An exotic imported from Europe, it threatens native grasses.

The plants grow from 4 to 8 inches in height and branch at the base. The leaves are narrow, strap-like, and covered with star-shaped hairs. In spring, yellow flowers are borne in racemes. Seeds are formed in silicles that are round, flattened and pointed at the top, much like a bellows. In summer, seeds drop out of the center of the pods, leaving a skeleton that resembles a pair of "spectacles."

yellow alyssum blossoms (1641 bytes) Flowers      yellow alyssum silicles (2315 bytes) Seedpods      yellow alyssum foliage (2105 bytes) Leaves are covered with star-shaped hairs      yellow alyssum root system (1161 bytes) Taproot

Control

Yellow alyssum has a taproot that can be easily hand-pulled from moist soil in the garden.

Post-emergent treatment with 2-4,D, or triclopyr is effective in controlling this weed in turfgrass. Yellow alyssum can be spot treated with glyphosate (Round-up, Kleen-up).

Photos: Judy Sedbrook

Back to Weeds

Back to Home

 

 

Ask a Colorado Master Gardener | Calendar | Children | Container GardeningCSU Fact Sheets
Credits | Diseases | FAQ | Flowers | Fruits | Gardening | GlossaryHouseplants | Insects & Pests
Lawn & Grasses | Links | New to Colorado | PHC/IPM | Soil | Shrubs | Trees
Vegetables | Water Gardening | Weeds | What's New | Who We Are | Xeriscape

Search

line4.gif (1411 bytes)

Contact Us | Disclaimer | Equal Opportunity

CSU/Denver County  Extension Master Gardener 2010
888 E. Iliff Avenue,  Denver, CO 80210
(720) 913-5278

E-Mail: denvermg@colostate.edu  

Date last revised: 01/05/2010