How to Build a Rain Garden

Rainwater is a natural resource that often becomes a nuisance when it pools against your foundation or washes out your mulch beds. By building a rain garden, you transform those problematic wet spots into self-sustaining filtration systems that recharge the groundwater table and provide essential habitat for local pollinators. Done well, a rain garden looks like a deliberate, vibrant landscape feature rather than a muddy ditch. It relies on deep-rooted native plants that thrive in both standing water and dry spells, creating a resilient ecosystem that handles heavy rainfall with ease while significantly reducing the load on your local storm drains.

1. Find Water's Natural Path. Observe where the water pools or flows during a storm and mark the footprint of your garden using a garden hose or landscape paint. Ensure the site is at least 10 feet away from your foundation to prevent basement seepage.
2. Dig the Basin Shape. Dig a shallow, basin-shaped hole between 6 to 12 inches deep. Use the removed soil to build a slight berm around the perimeter of the garden to help hold the water inside the basin.
3. Build the Perfect Blend. Mix a combination of 60% sandy soil, 20% organic compost, and 20% native topsoil into the bottom of the basin. This mixture ensures the garden can filter water effectively while providing nutrients for your plants.
4. Define the Garden Edge. Place river stones or large rocks along the interior slopes of your berm to prevent erosion. This also provides a clean visual boundary between the garden and your turf grass.
5. Set Plants in Clusters. Arrange deep-rooted native perennials, grasses, and sedges in the basin. Place moisture-loving plants in the center and more drought-tolerant varieties along the outer edges.
6. Mulch and Establish Roots. Apply a 2-inch layer of hardwood mulch around the plants to retain moisture and suppress weeds. Water the entire garden thoroughly to settle the roots into the new soil.