Newly planted trees and shrubs can take up to a year to become established in your landscape.
Hand water newly planted trees and shrubs twice a week for one to two minutes (about 5 to 10 gallons) each.
Do not rely solely on irrigation the first year after installation because the plant has not fully rooted in the existing soil.
The entire rootball needs to be saturated. Irrigation has a tendency to spread a thin layer of water over a wide area and can also overwater established plant material in conditions that are already wet enough.