Periodic foliar sprays of zinc sulfate may be required to maintain good growth. Fertilization is a key factor too. Pecan trees require ample nitrogen fertilizer for good production. If you decide you have the space to plant a few pecan trees, order up the proper variety for your location. When they arrive you may be surprised to find them in a strange container.
Pecan trees develop a true taproot that requires protection throughout shipping and planting.
Once severed, you can pretty much forget about nut production. For this reason, young trees are often shipped in a 15 gallon bucket with a second 7 gallon bucket on top to allow for ample space for the taproot. Dig the planting hole deeper than normal, but be certain that the backfill is compacted well to avoid settling. Try to ensure that the planting depth is the same as the level in the container. The graft union should always be above the soil level.