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How long do weed seeds survive in the soil?

Weed seeds can survive in the soil for years before they germinate and grow.

Feb 19, 2003 | News Story

Composting at Winter Green Farm Improves Soil Health and Protects Water Quality

In 1980 Jack Gray and Mary Jo Wade started Winter Green Farm just 20 miles west of Eugene, five years later Wali and Jabrila Via joined them and in 2009 long-time employees Chris Overbaugh and Shannon Shipp-Overbaugh also ...

Nick Andrews | Jul 2013 | Article

Scotch Thistle

Scotch thistle was introduced to the United States in the 1800s as an ornamental plant from the Mediterranean region. It is a noxious weed in Idaho, Oregon, and Washington. Scotch thistle can form dense, virtually impenetrable ...

Sep 2003 | OSU Extension Catalog

Russian Thistle: Management in a Wheat-Fallow Crop Rotation

Reviews Russian thistle biology as it relates to management, including seed dormancy and longevity in soil, seed distribution, seed germination and emergence, plant growth after establishment, crop competition, and resistance to ...

Aug 2019 | OSU Extension Catalog

Integrated Management of Mayweed Chamomile in Wheat and Pulse Crop Production Systems

In small grain and pulse crops throughout the high rainfall zones of the Inland Pacific Northwest, mayweed chamomile is a troublesome weed. Individual plants can produce as many as 17,000 seeds, and seed remain viable in the ...

Andy Hulting | May 2017 | OSU Extension Catalog

Perennial Weed Biology and Management

Explains how simple and creeping perennial weeds reproduce and spread. Covers weed seedbanks, seed dormancy in soil, and factors that influence seed germination. Describes the typical root structure of perennial weeds and the various...

Mar 2001 | OSU Extension Catalog

Do you have a green solution to pasture weeds?

Q: I take care of the family pastures (maintain irrigation) and was wondering what is the best way to get rid of weeds in the pastures. We have horse weed and a few others, not real bad but want to stop it and get ...

A: View answer | View all featured questions

How can I naturally kill dandelions?

Q: Is there a solution I can spray on dandelions instead of pulling them up? Not Roundup.... does vinegar, dawn soap and Epson salts work? Or is there a better one?

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Scotch Broom Smackdown!

Q: We want to eradicate scotch broom at our log pond project. Your PNW 103 publication is helpful. Like to know best size of weed wrench and proper handling / disposal of pulled plants.

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