Put a large mulched circle over the roots of new trees and shrubs, but do not mound bark mulch up around the trunk. Trees and shrubs grown under mulch develop stronger roots and are healthier. Be aware that mulch should be no more than 2-3 inches total or plant health can suffer.
Water new shrubs once a week the first summer with 5 to l0 gallons of water for each depending on the size of the bush. Take care to get the water under any mulch, which absorbs a great deal of moisture and robs the soil below. Pour water right down the stems so it goes into the root ball, and does not run off on the ground. During very hot sunny days, spray the tops and water lightly in addition to the weekly deep watering. Do not fertilize the first year, except possibly for half strength liquid fertilizer at planting time, or plant rooting hormone additives one can use. Fertilize normally the second year in the spring.