Dig the hole like a cylinder, not like a funnel. Planting too deep or too shallow stresses roots. Leave trunk wrapping on trees until they're established. Break apart clods and remove stones, and then backfill with the native soil, tamping lightly to help settle the soil around the roots. Don't add peat moss or other organic matter to the planting hole.
Amendments also discourage plant roots from exploring the surrounding native soil.
Water thoroughly after planting and as often as needed as the plant is getting established. Mulch to conserve moisture and prevent weeds. Stake only trees more than five feet high or those planted in an exposed, windy site. Remove any supports after the first growing season. For ornamentals transplanted in the fall or winter, fertilize them just before the growing season.