The solar company I was talking to did offer ground mounting for the panels but when you start laying them out on the ground you figure out how big they really are. Shadows are more of a problem in the ground too since level low shrubs will be a problem in the winter. In my case it is an oak tree that is not on my property.
It is kind of ironic that to cut green house gasses we may have to cut down trees.

Greg Fretwell