![]() ![]() ![]() Deeper roots can access soil moisture deeper in the ground. Encourage a deeper root system during the growing season by providing more water less frequently.Mulching insulates the roots from severe temperature fluctuations and keeps water in the soil. Apply two to four inches of mulch around the tree’s base, out to the edge of the drip line.Drive stakes slightly outside the drip line around the perimeter of the tree, wrapping the protective material around them to create Use burlap or canvas to create barriers protecting the plant from dry winter wind and sun.Winter burn is preventable by protecting trees from the wind, minimizing water loss, improving the root system, and fertilizing appropriately. Symptoms typically appear at the tips of the branches and progress inward towards the center trunk. A combination of freezing temperature, dry winter winds, sun, and a lack of water in the soil causes arborvitae foliage to turn brown because it is drying out. If you observe your arborvitae turning brown during the winter or early spring, the cause is likely winter burn. Quickly treat disease problems on other plants in your garden to minimize spread.Wounds in the bark are a quick entry point for some pathogens. Be careful when mowing around trees to prevent damage.Mulching prevents soil-borne fungal spores from splashing up onto the branches when watering. After planting, spread a layer of mulch on the ground around the plant.Ensure you are watering and fertilizing the arborvitae correctly.Unhealthy, stressed trees are more susceptible to disease problems. The best way to prevent fungal diseases is by keeping your thuja tree in good health through proper care. Browning begins on low branches close to the trunk and spreads upward, leaving only the tree’s top unaffected. Cercospora leaf blight affects Oriental arborvitae but not American ( Thuja occidentalis).Yellow spots morph into faded light green, that ultimately brown. Phomopsis twig blight starts in the tips of immature branches.It is opportunistic and usually occurs when there is already an insect or pathogen problem. The area may be dotted with black, pimple-like structures. As the infection progresses, it moves towards the base of the needles. Pestalotiopsis tip blight affects the ends of the branches, causing dead spots or blotches.Where the dead wood meets living tissue, you will see black, pimple-like fungal structures. Kabatina twig blight kills the tips of one-year-old branches.While arborvitaes are known and revered for being easy-to-care-for trees, they are susceptible to several fungal problems that can result in your arborvitae turning brown. Follow the best cultural practices to keep your arborvitae trees healthy, and the needle drop will be reasonable and restricted to old-growth instead of new growth. Seasonal needle drop from a tree cannot be prevented since it is a normal and natural process. How can seasonal needle drop be prevented? An entire branchlet on the tree turns brown as it ages and may remain on the tree for some time before dropping. Instead, they shed their “leaves” every few years as a natural part of their life cycle. Thuja trees are conifers, meaning they don’t drop their foliage every year like deciduous trees, and they don’t lose needles every year like evergreens. Seasonal Needle DropĪ natural cause of browning is seasonal needle drop. It is essential to determine if the browning is natural or a symptom of a larger problem to prevent reoccurrence. Why They Turn BrownĪrborvitaes turn brown for a handful of reasons, both natural and induced by disease, winter burn, and pests. Keep reading to find out how you can save your evergreen tree. It is not difficult to prevent your thuja from turning brown, but the first step is to understand why it is changing colors. No one wants to see something they’ve planted around their home, looking less than vibrant and healthy. ![]() However, if you notice that your thuja is losing its luster or turning brown, it can be quite disheartening. The beauty of arborvitae trees is that they are evergreen and will not shrivel or turn brown like most other trees. ![]()
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