So I'm a mowing/applications guy and decided to take on a overhaul of my landscape at my personal home. I hired a designer who has given my a plan and selected the proper plants for my zone and location. I'm interested in tips and hints on installation. Is it necessary to fertilize or mix compost with my back fill? I'm in sandy loam soil and it looks pretty healthy. I've also seen different planting depth articles. Some say leave the potted root ball a little above soil level to allow for water run off and to prevent drowning. The other says to plant lower to have the "bowl" in order to hold water. So what's the best method.