Now that you have invested in a new landscape, it is important to protect your investment through proper landscape watering practices. Plants prefer infrequent deep watering to saturate the entire rootball. This will encourage the roots to grow deeply. If you only water at the surface the roots will only grow at the surface allowing the root-zone to quickly dry out. Do not rely on rain to water new plantings. Probe the soil before you water and then water accordingly. If there is moisture in the soil the plants should be fine. If it is dry you need to water. Do not water saturated soils.
When it is not too hot or too dry, new plants should be watered once a week for about two hours.
When it is hot, dry, and humid, plants should be watered about twice a week. Summer watering practices will vary due to several factors including sun exposure, slope, and temperature. If the grade is steep, it will require more water. Deep heavy watering or a thorough soaking is best. Please probe the soil to see if it is moist or wet. Check again in a few days, and if dry, water again.
When it is not too hot, plants can be watered less often. Evergreens, however, will need more water in the fall to help them sustain their foliage over the long winter months.
New plantings will need to be watered in this fashion for the first year (until the ground freezes). They may also need some supplemental watering if the following summer is hot and dry.