Hi everyone. I am brand new here and in desperate need of advise! My backyard in on quite a slope and I am wondering about the best method for planting flowering trees. Swales seem like a good idea, but this is a yard and all those waves.... I could fill it in with rock maybe to keep the surface even... Or should I set each tree into the ground at the lower-edge level and kind of sink it into a hole to catch runoff rainwater. As you can see I am quite clueless!