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Rhododendrons and azaleas need a strong acidic soil

Check out yellow leaves on rhododendrons and azaleas.

Jun 4, 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

Take steps in fall to protect roses in winter

Fall maintenance can help protect roses from winter weather. Follow these tips to keep your rose bushes happy and healthy.

Barbara McMullen | May 2007 | Article

Container Planting

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

May 2018 | Fact Sheet

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

Growing Hazelnuts in the Pacific Northwest: Orchard Site Selection

This publication describes factors to consider when deciding to plant a hazelnut orchard and includes a table of native productivity ratings for soil series types in the Willamette Valley.

Nov 2013 | 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

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

Selecting Native Plants for Home Landscapes in Central Oregon

If planted in a suitable habitat, native plants are well adapted to Central Oregon soils and climate. When grown in the right conditions, native plants experience less environmental, insect, and disease damage than nonnative plants.

Amy Jo Detweiler | May 2008 | OSU Extension Catalog