Regular watering is incredibly important during the establishment of newly planted trees, shrubs and herbaceous plants. Keep the root system moist, but not too wet, for the first six to eight weeks after planting. Allow the soil to be your guide as to how often you should water, but keep these general time frames in mind for new plantings.
For freshly planted herbaceous plants use a general- purpose fertilizer during their first year of growth
For shrubs and trees use a fertilizer with a nitrogen source of 12-16 percent. Broadcast fertilizer about 6″ from the trunk to 12″ past the canopy. Applying up to 3 times during the growing season of their first year. Follow directions closely on product and for variety.