Bill Oliver wrote:
I have recently acquired a house with a septic tank. The books I have
read say not to plant shrubs or trees near the tank or drainage field
because the roots will damage it. Unfortunately, it's exactly in an
area I want to cross with a border.

Are there any trees/brush suitable for a hedge that have a superficial
spreading root system shallow enough to be safe for a septic tank?

A lot of good info here concerning your drain field and plants:
http://www.ext.vt.edu/pubs/envirohor...7/426-617.html