Planting a tree properly is the difference between a trees life and death, often.
While you should not need a post-secondary degree on the subject it helps to know a few basics.
First, the hole needs to be twice as wide and 1 and 1/2 times as deep as the tree root structure [the pot or ball]. Most roots will grow laterally versus vertically.
Second, plant high. That is, above grade. Allow the water to run down into the outside portion of the tree root zone, not into it's 'neck' or trunk.
Generally plant about 20 to 30 cm. above grade.
Third, finish with a layer of bark mulch. Do not mulch up to the trunk: keep the mulch a couple of centimetres away from the 'root union' where the trunk meets the root zone (this is called the root flare.)
Fourth, water. Apply generous quantities of water at the beginning and slowly cut back, making sure that as winter approaches the soil is moist. A trees' roots are actually insulated by frozen soil. Do not make it 'swampy' though...
Finally, buy a good tree in the first place. Look for a straight trunk, a well shaped crown and above all look down... at the roots. You want a dense root structure but not one that completely encircles the inside of the pot. Ideally the pot should be filled with 1/2 roots and 1/2 soil.
For more information on tree planting go to:
