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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

Rhododendrons and azaleas need a strong acidic soil

Check out yellow leaves on rhododendrons and azaleas.

Jun 4, 2010 | News Story

Bareroot Shade, Flowering, and Fruit Trees (Willamette Valley) Fertilizer Guide

This guide can serve as a starting point for development of nutrient management guidelines for Oregon growers. Recommendations in this guide are based on research performed in the Willamette Valley with other cropping systems and ...

Dan Sullivan | Oct 2010 | OSU Extension Catalog

Methods to control blackberry thickets

It could take years to eradicate a large patch of blackberries, because so many seeds remain in the soil. But with good timing and dedication, property owners can reduce a sprawling blackberry thicket to a few manageable stragglers

Mar 26, 2010 | News Story

General care for hydrangeas

Look to this hydrangea how-to for advice on soil, water, pruning and more. Learn a simple pH trick that will turn blooms from pink to blue.

Kristin VanHoose | Jun 2018 | Article

Container Planting

This fact-sheet explains container planting, including types of containers, soil for containers, and fertilizer.

May 2018 | Fact Sheet

Management Strategies for Dealing with Select Poisonous Plants in Oregon

Rangeland, pastures and hay fields throughout Oregon often contain poisonous plants that are potentially dangerous to cattle and other livestock.

Andy Hulting, Karin Neff | Sep 2019 | Publication

Plants Causing Nitrate & Oxalate Poisoning in Pastures

Some plants absorb excess nitrates or oxalates from the soil and store them in plant tissues. Toxicity problems can occur in animals which feed on these plants.

Mylen Bohle, David Hannaway, Andy Hulting, Karin Neff | Apr 2018 | Educational Document

Trees and Shrubs for Erosion Control

A list of recommended trees and shrubs in Oregon, good for controlling erosion.

Jul 2018 | Collection

How much water do my citrus trees need in the winter?

Q: We have a Meyers lemon tree and a lime tree both in pots. We place them in an outdoor shed in the winter with broader lights that come on between 35-40 degrees to prevent freezing. My question is how often should we water them and how much?

A: View answer | View all featured questions