Planting over septic drain field
I re-did my septic drain field this year and did not replant a lawn. My home is on a heavily wooded lot and the septic drain filed is in the front of the house, and is the only sunny area we have. I was going to plant ground covers and perennials. I understand that I can't plant shrubs because the roots will reach down to the water and cause damage to the stuff that I just spent lots of money to install. Here's my idea, what if I plant shrubs in their pots within another pot. Perhaps I could re-pot a new shrub in one of those paper pots that are bio-degradable, and plant that pot, into a larger plastic pot. I would fill the space between the two pots with soil. Every couple of years, I would take them out and prune the roots to make sure they didn't escape. I would be careful not to plant any particularly aggressive plant like bamboo, of course.
Is this a bad idea? Has someone done this before? What could go wrong?