Search OSU Extension

Showing 1 - 10 of 96 results.

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

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

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

Yesterday's Orchard, Today's Home: Legacy Pesticides on Former Orchards

Residues of lead arsenate, DDT, and other persistent pesticides may be in soil where orchards once grew and homes now stand. This report discusses how to investigate former pesticide use and current pesticide residues on your ...

Dave Stone, Kim Anderson | Mar 2009 | OSU Extension Catalog

Are lupines the answer to my difficult yard?

Q: I'm an urban rental dweller--West Portland--whose elderly landlords would rather deal with issues with the house rather than the yard, on which grass seed that I've bought does not grow; the soil is depleted and I can't ...

A: View answer | View all featured questions

Azalea and Rhododendron Care and Culture

Explains how to plant or transplant rhododendrons and azaleas. Discusses soil, fertilizer, and water needs. Covers cultivation, winter damage, pruning, propagation, and problems such as nutrient deficiencies and insect pests.

Feb 2001 | OSU Extension Catalog

Dahlia Culture

Discusses how to grow dahlias, beginning with soil preparation, fertilizer needs, and planting. Includes information on propagation, how to handle cut flowers, and digging and storing tubers. Also discusses insect and disease problems.

Apr 2000 | OSU Extension Catalog