Answer: Generally speaking the hole should be several times wider than the rootball and about the same depth. You plant so that the roots are not crowded in the hole, and so that there is a generous area of loosened soil around them to encourage root growth into the surrounding soil. When you set the plant in the ground, it should be no deeper than it grew before. As to specific size of the area to dig, that depends on the size plant you receive. You do however want to allow room for the plants to reach their mature size. These generally run in the range of 5 to 10 feet tall and wide so be sure to allow plenty of space even if the seedlings are on the small size when you receive them. If you are planting them this fall, also mulch heavily in late fall to help protect them from freeze/thaw heaving this winter. Here is a little more information you may find helpful in terms of siting them successfully. You may need to cut and paste the complete url into your browser to make it work correctly.
Q&A Library Searching Tips