Will this help?

Vera

Here is a link that might be useful: Landscaping Septic Systems-University of MN

www.prairienursery.com - sells a septic field mix of native grass and wildflowers - they are good for septic systems and i think their mix stays away from deep tap rooted plants and consists mainly of deep fibrous rooted plants - which are better for the septic field ...

There is some information on this link about a septic prairie mix with a septic system.

Terry

Here is a link that might be useful: septic mix info