Question
Hi Tom,
I am thinking about planting knockout roses, and forsythia bushes next to my house. The problem I may have is; I have a sewer pipe (pvc) and an underground flexible plastic pipe running about 2 feet beneath where I'll be doing the planting. I do not want any roots interfering with these 2 pipes. Do you forsee any problems? I live in central Kentucky.
         
         Thank You very much,
         Earl

Answer
Hi Earl,
Thanx for your question.  While the knockout rose doesn't seem to have a deep root system, forsythia does and I would caution against planting it over a plastic pipe as you described.  I hope this helps.  Your local horticulture agent at your county extension office can give you some pointers for what to plant in your area.  If you give me your county, I can give you a contact point.  I hope this helps.
Tom