Lynn Ketchum

Featured Resources

Latest Resources

Tree School Clackamas teaches love for the land

Educational event draws hundreds from woodland community in Clackamas County and beyond.

By Glenn Ahrens, Rose Clarke, Michael Bondi, Kimberly Jacobsen Nelson | Article

Controlling crabgrass, Bermuda grass, and nutsedge in your lawn

Presentation on controlling crabgrass, Bermuda grass, and nutsedge in your lawn

By Don Horneck | Presentation

Latest News

Roll up your sleeves: Invasive weeds need persistence to control

Feb 23, 2018
Invasive weeds enter backyards in multiple ways and once there can cause havoc.

By Kym Pokorny | News Story

Pull weeds as they pop or plants will suffer

Apr 15, 2016
Extension expert offers advice on how to control stubborn weeds

By Kym Pokorny | News Story

Upcoming Events

Meet Our Experts

Thumbnail
Weed Science
Thumbnail
Community Horticulture/Master Gardeners
Thumbnail
Senior Research Assistant
Weed Control

Have a Question? Ask an Expert!

Ask an Expert is a way for you to get answers from the Oregon State University Extension Service. We have experts in family and health, community development, food and agriculture, coastal issues, forestry, programs for young people, and gardening.

Ask Us a Question

What should I be doing now for weed control?

The straw mulch I used at the end of summer to suppress the weeds doesn't seem to be working. Should I till it and cover with plastic? black or clear? Is there something better. Or should I add more straw. I could probably bring some cardboard home from work. Is this a healthy option?

By Ann Kinkley | Featured Question