Best Plants for Drain Fields
When choosing plants for a Glendon-type septic system, prioritize those with shallow root systems to avoid interfering with the septic system's operation. Avoid plants with aggressive root systems or runners, and those that could potentially clog or disrupt the system.
Herbaceous Plants
Herbaceous plants (annuals, perennials, bulbs, ornamental grasses) are one of the safest and most effective choices for septic drain fields. Their roots stay close to the soil surface, which helps prevent damage to pipes and distribution lines below. These plants also improve soil stability, reduce erosion, and allow oxygen and moisture to move naturally through the soil; key factors in a healthy drain field. Because they’re lightweight and flexible, they won’t compact the soil or interfere with system operation.
Non-Woody Perennials
Non-woody perennials provide long-term ground coverage without the risks associated with trees or large shrubs. Their shallow, fibrous root systems absorb excess moisture while avoiding deep penetration into the drain field. Since they return year after year without aggressive growth, they offer a low-maintenance way to protect the soil surface and keep the system functioning as designed.
Small Ornamental Grasses
Small ornamental grasses are especially well-suited for drain fields because their fine, dense roots knit the top layer of soil together without growing deep enough to cause problems. They help control erosion, tolerate variable moisture levels, and allow water to percolate evenly into the soil. Their upright growth habit also keeps heavy foot traffic off the drain field, which helps prevent soil compaction.
Wildflowers
Wildflowers combine beauty with function. Many native and adapted wildflowers have shallow root systems that thrive in well-drained soils without disturbing septic components. They support pollinators, improve soil health, and reduce the need for mowing or irrigation. When properly selected, wildflowers create a natural, low-impact landscape that works with the drain field instead of against it.
Shallow-Rooted Trees and Shrubs
Certain small trees and shrubs such as dogwoods, Japanese maples, Eastern redbuds, dwarf cherry trees, hydrangeas, azaleas, boxwoods, and holly can be appropriate near drain fields when their root systems are known to be shallow and non-aggressive. These plants should be placed strategically, not directly over key components, to provide visual screening and landscaping benefits without risking root intrusion. Choosing dwarf or slow-growing varieties further reduces long-term risk.