![]() Newly planted trees and shrubs don’t have fully developed root systems, which inhibit their ability to efficiently take up water to keep the leaves hydrated. Therefore, water loss is higher in the summer, and if that water isn’t replaced your arborvitae may start to become drought-stressed. Higher temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open, whereas colder temperatures cause the openings to close. Transpiration is the evaporation of water from plant leaves. In summer, restoring lost moisture can also be an issue when the temperatures are high and rainfall is scarce. In winter if the ground is frozen the plant’s roots won’t be able to replenish the lost moisture. Strong winds, both in winter and summer, can lead to water loss in trees and shrubs. ![]() If your area isn’t getting regular rainfall and you’re not offering your arborvitae supplemental water it will begin to become stressed out, often showing signs of browning. In most soils and conditions a good rule of thumb to follow is that most established plants need about 1 inch of water per week. Here are some of the reasons why your arborvitae might be turning brown. But, like all plants, they are susceptible to unfavorable environmental conditions that can cause stress and even death. They can grow in full sun or partial shade and have the ability to thrive in a variety of soil conditions from heavy clay to light sand. Arborvitae can be a wonderful addition to your landscape because they’re so adaptable.
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