Plant pear trees in early spring. Order bare root plants in mid-winter so that they arrive in time.You’ll need full sun for best fruit set and fertile, well-drained soil as well as good air circulation. If you live outside of the dry western regions, you should choose fire blight–resistant types and rootstocks. Plan to plant at least two varieties of pear trees, as they will need to be cross-pollinated to produce fruit. Make sure the varieties are compatible with each other. Space standard-size trees 20 to 25 feet apart. Space dwarf trees 12 to 15 feet apart. For container-grown trees, remove the plant from its pot and remove any circling roots by laying the root ball on its side and using shears to cut through the roots. For grafted trees, position the inside of the curve of the graft union away from the sun when planting. Dig a hole that is a few inches deeper and wider than the spread of the roots. Set the tree on top of a small mound of soil in the middle of the hole. Be sure to spread the roots away from the trunk without excessively bending them. Do not add fertilizer or topsoil to the hole.