What should you NEVER plant above a septic drain field?

Planting trees and large shrubs above a septic drain field is not advisable due to their extensive root systems that can invade and damage the septic system. Roots can penetrate the pipes, leading to blockages and potentially costly repairs. The presence of large plants can also hinder the proper functioning of the drain field by absorbing too much water, which can lead to system failures.

In contrast, smaller plants like flowers and ornamental varieties, as well as grass and ground cover, are generally acceptable because they have shallower root systems that pose a minimal risk to the septic infrastructure. Vegetables and herbs, while also having roots that don't typically reach deep enough to be dangerous, may complicate issues related to health and safety due to potential contamination from the septic system.