Green Neighbors Program

The Clark County Green Neighbors Program is coordinated by Clark County Public Health’s Solid Waste and Environmental Outreach to assist citizens with developing more sustainable lifestyles and building a strong environmental community in Clark County. Solid waste regional planning and programs are a cooperative effort of Battle Ground, Camas, Clark County, La Center, Ridgefield, Vancouver, Washougal, and Yacolt.

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Hardy Geranium

  • Scientific Name: Geranium
  • Garden: Beneficial Insects and Compost Garden
  • Plant Type: Herbaceous Perennial
  • Evergreen/Deciduous: Deciduous
  • Sun/Shade Exposure: Full Sun to Part Shade
  • Moisture Requirements: Moist, Well-Drained

Plant Information

Hardy geraniums are easy to grow and are relatively disease and insect resistant. They require well-drained, fertile, and moist soil. Most are cold hardy to –20oF, with some being much hardier, and others less so. If a hardy geranium grows too tall and rank, trim foliage back, leaving 3 inches of plant material. Plants will put out new growth and perhaps a few new flowers. When planting, add compost and work it into the soil. In clay soils, add perlite or sharp grit, to help improve drainage. Add a little slow-release fertilizer and water well.

Many hardy geraniums are ideal for growing in hyperfufa (alpine troughs), rock gardens, or containers, making them a versatile and useful addition to the garden. Apply a mulch in the late fall, after 3 or 4 days of hard frost, so that ground stabilizes. This helps prevent frost heave, which can leave plant roots and crowns exposed to freezing winter temperatures. 

Although pest and disease problems are rare, the following problems can occur: Aphids, Slugs, Vine Weevils, Bacterial Blight, Gray Mold, Powdery Mildew, Rust, and Virus can also be a problem. Check with your local Master Gardener program for current control measures.

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©2021 Cheri Moland