Here's how I plant trees: dig a hole twice as wide and just as deep as your tree. place tree in hole and turn it around until you like what you see. Toss in a GENEROUS shovel full of Moo Doo or other compost and some slow release fertilizer too. Then fill the hole up 1/2 way with dirt and pat down. Then totally fill the hole with water and go did a hole for one of the other FOUR trees while you wait for the water to drain. When the water is drained, fill up the hole the rest of the way and pat down. Cover with copious amounts of mulch to the tree's drip line, but keep the mulch away from the trunk.
I worked my ASS OFF digging and digging, and turning and turning and stepping back to look, and filling and watering and mulching then I collapsed on the back porch in exhaustion and saw this. And it was good.