Green Giant Arborvitae - one of our most-planted privacy trees - thrive when they receive deep, consistent watering, especially during their first 1–2 years after planting. Newly planted trees typically need about 10–15 gallons of water per week, either from rainfall or irrigation, while established trees generally only need supplemental watering during hot or dry periods. Deep watering encourages strong root growth, helping the trees become more drought tolerant and resistant to stress over time.
Proper moisture is essential because Green Giants are fast-growing evergreens that use a significant amount of water to support their dense foliage and rapid growth. Without enough water, they may begin to show browning tips, thinning branches, or slowed growth. Overwatering, however, can be just as harmful, leading to root rot and poor health. For all of our plantings, we generally recommend watering every 2–3 days on 45–60 minute cycles - this allows the plants to get a deep drink, then gives them a few days to put energy toward growth rather than spending it all just soaking up water every day.
Once a landscape is established, the watering approach shifts. Summer heat puts significant stress on trees, shrubs, lawns, and beds, and deep, infrequent watering is usually more effective than frequent shallow watering, because it encourages roots to grow deeper into the soil where moisture is retained longer. Without adequate water, plants can become stressed, leading to wilting, discoloration, reduced growth, and increased susceptibility to pests and disease - so staying ahead of dry stretches protects the investment you've already made in your landscape.