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You should exercise care when deciding how to landscape over a leach field for your septic system. You typically want lightweight materials that won’t damage the drain field’s perforated pipes. When adding plants to the area, select plants with shallow roots, such as grass or flower gardens. Trees with deep roots could damage the pipes in the field.

While you can leave roots in the ground, if you don’t want the shrub to regrow again over time, it’s best not to leave any roots behind. Ensure you remove as much of the shrub as possible, including the root ball and any main roots you can see, to prevent new growth. Some gardeners opt for using a chemical treatment to prevent the stump from growing back, but this can kill beneficial microorganisms living in your soil.

Grass is the most popular and safest option for planting over a septic drain field, but you can also plant small flowering plants and other lightweight plants that don’t have woody or deep roots. Avoid trees and bushes within 10 feet of the field, as the woody roots can crack the perforated pipes. You should also avoid planting vegetable or fruit gardens over your drain field, as a leak from the pipes could contaminate the soil and put anyone who eats the produce at risk.

A window flower box should be deep enough that there’s room for a wide selection of plants and the required amount of soil and gravel. Standard flower boxes are 8 inches deep and 8 inches from front to back. Larger is better to increase the variety of plants in the box, but you could run into stability issues as it increases in weight.