planting trees close to a mound system septic field

Asked February 2, 2018, 12:22 PM EST

We are wondering how close we can plant trees around a mound system drain field. If the roots follow water then they would surely like the mound system. If the roots get into the mound system this will be detrimental to the life and performance of the system. How close should we tell customers to plant trees?

Carver County Minnesota

1 Response

Here are guidelines from a University of Minnesota bulletin:

  • Do not place trees and shrubs ON the mound; they may be planted at the foot or on side slopes. Frame the mound with trees and shrubs at a distance, but use only herbaceous (non-woody) plants on the mound itself. Trees should be planted a minimum of 20 feet from the edge of the mound. Trees known for seeking water reservoirs, such as poplar, maple, willow and elm, should be planted at least 50 feet from the mound. Shrubs should not be planted on top of the mound.

Go here to read the complete bulletin:

https://www.extension.umn.edu/garden/yard-garden/landscaping/landscaping-septic-systems/