Now accepting applications for the 2019 Master Gardener Volunteer Training and Horticultural Proficiency programs!!


The Master Gardener and Horticulture Proficiency program provides Oregonians with education about gardening and horticulture. Read More...

UC Davis Weed ID

Online Resource

The Weed Research and Information Center is an interdisciplinary collaboration that fosters research in weed management and facilitates distribution of associated knowledge for the benefit of agriculture and for the preservation of natural resources.

Fewer weeds equals more quality forage


Weeds can lower the quality and quantity of forage in a pasture or hayfield. In general, weeds have lower protein and energy than improved, cool season perennial and annual forages under good grazing...

By Shelby Filley

Forage value of pasture weeds


Forage quality of common pasture weeds was determined through laboratory testing to compare feed value of weeds to desirable forage species and nutrient requirements for grazing livestock.

By Shelby Filley, Andy Hulting

Pastures can contain a mixture of weeds.

Avoiding poisonous plants in pasture and hay


How to identify, manage, and avoid poisonous plants in your pasture.

By Shelby Filley

Common Weeds Found in Central Oregon

Fact Sheet

List of weeds commonly found in and around Central Oregon.

By Toni Stephan

Columbia Gorge - Cooperative Weed Management Area

Online Resource

Throughout the Columbia Gorge, the Mt. Hood National Forest, and surrounding lands, there are a multitude of impacts which arise as a result of invasive weeds. Some of the most prevalent and intrusive impacts include degradation of water quality, loss of wildlife habitat, loss of rare and typical native plants in natural areas and open spaces, and increased roadside and power line maintenance costs.

Jointed Goatgrass



Annual; Foliage is a deep blue-green. Prior to seed formation plants tend to lie flat on the ground. Spikelets are awned, the longest awns at the top of the spike. Seed heads break...

Reduce Weeds by Friending Grasses


Are weeds a never-ending challenge for you? If so, consider looking at them from a new angle. Instead of spraying or digging weeds out year after year, concentrate on making your grass happy. The factors that promote optimal grass health and production work against weed growth. What is good for grass is not good for weeds.

Poison Hemlock (Conium maculatum) – Silage Will Not Reduce the Toxin


Poison hemlock is one of the most poisonous of plants. Silage making has been used to reduce the concentrations of toxins in a variety of crops. Poison hemlock alkaloids are found in different concentrations depending on several factors that make it virtually impossible to predict how dangerous the plant is at any given time.

By Cassie Bouska

Tansy Ragwort


Biological control of Tansy Ragwort and additional information and advice including herbicide options.

By Shelby Filley, Andy Hulting, Gene Pirelli

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