How to Landscape Over a Septic Tank

Select shallow-rooted, native plants, groundcovers or grasses that won’t require regular care, watering, irrigation or fertilization. Don’t plant large shrubs, trees or edibles like vegetables and herbs above the septic system.

Scratch the soil surface using a garden rake or pitchfork to loosen the top 2 to 3-inch layer of topsoil, if you’re planting grass or wildflower seeds. Avoid tilling the area over your septic system using a rototiller because you could damage the underground system components.

Spread the seeds onto the loosened soil. Water the area lightly using a garden hose with a spray nozzle to barely moisten the seeds.

Dig holes just deep enough to plant the root systems of small plants that you’re using to landscape over your septic system. Select shallow-rooted plants that will require digging planting holes that are no more than 1-foot deep at the very most.

Amend the soil with organic compost at planting if you desire, but do not add fertilizers. Don’t water the plants or grasses, and instead choose plants or grasses that are drought-resistant, or native to your area and can thrive with normal rainfall only.

Plant any larger shrubs or trees at a distance away from your septic system that is at least twice the width of the branches or “crown” at the tree’s maturity.