Rain Garden Design: Build a Beautiful, Eco-Friendly Drainage Solution

A rain garden is a shallow, planted depression that captures runoff, filters pollutants, and recharges groundwater—while adding beauty and habitat to your yard. Proper placement and construction ensure effectiveness and longevity.

Choosing the Right Location

• At least 15 feet from house foundation
• At least 10 feet from septic systems
• Full to partial sun for plant health and evaporation
• Near a downspout (optional but helpful) for directed runoff

Construction Steps

1. Determine size—larger gardens handle more runoff and support more plants
2. Dig 4–10 inches deep (deeper for clay soil, narrower beds; shallower for sandy soil, wider beds)
3. Keep bottom level; measure depth from lowest edge on slopes
4. Mound excavated soil on 3 sides (downhill side on slopes) to form a berm
5. Connect downspout via swale, extension, or underground pipe if possible

Rain Garden Plant Selections

Choose native species adapted to periodic flooding and drought. Sample list:

• Blue flag iris, cardinal flower, cinnamon fern
• Sedges (fox sedge, grass-leaved goldenrod)
• Joe-pye weed, milkweed, black-eyed Susan
• Switchgrass, tufted hairgrass
• Wild columbine, wintergreen, yellow coneflower
• Various asters, ferns, goldenrods, and native grasses

Plant in zones: wettest-tolerant in center, drier-tolerant at edges. A well-designed rain garden manages stormwater beautifully.