prickly lettuce,seedhead  (17016 bytes)

How weeds spread

By Joe Julian, Colorado State University Cooperative Extension, Horticulture/Entomology

Common garden weeds spread either by human action or through the forces of nature. Virtually none of the weeds we contend with are native to North America. Crabgrass, for example, came from Eurasia; purslane from western Asia and quackgrass from Europe.

Seeds move via the wind or they are carried by birds. They may be carried in the hair, fur or intestinal tract of animals that transverse long distances. Sometimes grasses, with their seeds intact, are carried in the ocean currents until they find a landing spot. On a more local level, seeds can move into our yards via straw, hay or animal manures. Weed seeds can even be mixed with grass seed or turf, so when you seed or sod your lawn, you could be importing a crop of weeds too.

Photo: Judy Sedbrook

Back to Amazing Facts

Back to Gardening Topics

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