If you can't go UP with a large enough berm, etc. how about down? What's your water table situation? Can you do a dug out patio/courtyard area for sitting and teaching in?
"The world is changed by your example, not your opinion." ~ Paulo Coelho
Whose rules are you playing by? This tiny ad doesn't respect those rules:
montana community seeking 20 people who are gardeners or want to be gardeners