After planting, thoroughly water the entire area. Subsequent water should then be applied close to the tree for 6 to12 months, then moved outward to accommodate the spreading roots.
Trees should be watered to wet the entire root zone and to get good, deep penetration into the soil. During the first year, the tree may need to be watered as often as once every 5-7 days. Once established, water needs should be less frequent. The exact schedule will depend on the kind of tree, type of soil and the time of year.
Newly planted trees need no fertilizer. A small amount of fertilizer can be applied starting the second year.
Do not prune the newly planted tree during the first year, except to remove dead or badly damaged branches. Side branches help the tree develop strength and increase the trunk diameter.