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The Daily Insight

Why are my arborvitae turning brown on the bottom

Author

Lucas Hayes

Updated on April 21, 2026

Excessive water will cause the plant to have root rot, thus destroying the plant’s ability to nourish itself. The plant will brown from the bottom up and die. If conditions are too dry, plant roots are still unable to nourish the plant. … Water the plant well and always mulch to help retain moisture.

Can a Browning arborvitae be saved?

Brown arborvitae can be saved from conditions that cause it to brown, but it may not be as healthy as it was. But that does not mean it cannot be saved. A branch that has turned brown can grow out and parts of the branch closest to the trunk will grow to their natural green.

How do I know if my arborvitae is overwatered?

Symptoms of overwatering your Arborvitae can be similar to those of underwatering. You may see this change to yellow or brown colors in the branches and needle drop. Too much moisture or insufficient drainage can also lead to root rot.

Will bottom of arborvitae grow back?

It might take a season or two, but they will grow back. The best way to prevent it from happening is too burlap the Arborvitae going into winter to protect them, especially when newly planted. If they are too big, then put 5ft stakes around them with mesh netting to lessen the chance of a deer attack.

Should I trim the brown off arborvitae?

Like most conifers, arborvitaes will not produce new growth on older bare stems, so they don’t tolerate renovation or hard pruning. Cut into the brown, and it will stay that way. To maintain plant health, don’t remove any more than one-third of the live foliage area per growing season.

How do you rejuvenate an arborvitae?

In extreme cases, weak and spindly arborvitae may be stimulated to fill out by cutting back. Cut the top 2 feet or so of the arborvitae off. Use a pruning saw to make the cut above the nearest lateral branch. The arborvitae will bounce back to produce fuller growth over the season.

Will arborvitae grow back after turning brown?

Brown arborvitae can be saved from conditions that cause it to brown, but it usually doesn’t change back to the healthy green it once was. That doesn’t mean the entire tree can’t be saved, however. … Give the tree time to see if it’s able to recover or if the new growth from the tree is any different.

How do I know if my arborvitae is dying?

  1. 1 – The Bark Turns Brittle and Brown and Starts Cracking. …
  2. 2 – Lack of Healthy Leaves. …
  3. 3 – Excessive Amounts of Deadwood. …
  4. 4 – Fungus and Pests. …
  5. 5 – Foot Damage. …
  6. 6 – Scratch Test.

What is the best food for arborvitae?

Best Fertilizer For Arborvitae We recommend using slow release fertilizer that has 50% nitrogen and has a high first number, like a 12-6-4 or 10-8-6 mixture. Granualized fertilizer works the best because it helps prevent the roots from burning and allow you to only fertilize once per year.

How do you keep arborvitae healthy?
  1. A dense, narrow, evergreen shrub or small tree, arborvitae makes a wonderful privacy screen and windbreak. …
  2. Tree pruning, watering, and using arborvitae tree fertilizer on a regular basis will keep your arborvitae tree as healthy as possible.
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Will arborvitae recover from overwatering?

Arborvitae will tolerate a moister soil than many evergreens, but they will “drown” if kept overly wet.

How do you water emerald green arborvitae?

An Emerald Green Arborvitae requires little care other than watering and pruning. Water a newly planted tree every three to five days during the growing season, applying the water evenly over the root zone at a rate of 10 gallons of water per inch of the trunk’s width.

Can you water arborvitae too much?

Symptoms of Overwatering Although arborvitae enjoys moist soil, it requires adequate drainage and will suffer if over-watered. Symptoms of excessive water around arborvitae roots are similar to those of drought stress and include foliage discoloration or dieback.

How do you treat brown arborvitae?

  1. Prune the affected foliage to remove the unsightly tissue. Pruning allows more light in and stimulates growth of new foliage.
  2. Water regularly at the base of the plant during dry periods.
  3. Fertilize in spring to stimulate production of new foliage.

Do arborvitae need to be trimmed?

These plants can tolerate heavy pruning, but usually only need trimming to repair growth abnormalities to enhance their longevity and overall appearance. … Because arborvitaes grow continuously during the growing season, you can prune them at any time through mid-summer.

Can you trim the bottom of arborvitae?

Arborvitae will produce growth from dormant buds on old wood. The lower branches need sunlight and air flow to grow so you will need to continue to trim these trees. Both the vertical shoots at the top and throughout the tree should be trimmed so that they don’t shade and prevent air flow for the bottom branches.

How often should I water my arborvitae?

When arborvitae are planted they should be watered daily and the soil kept moist. Think “low and slow” by turning the garden hose on low and watering the root ball very slowly. A few drops per second for 2-4 hours (depending on how quickly the soil drains) per day on the first 10 days will work well.

How do you treat an arborvitae fungus?

Apply a fungicide to protect plants. Twig tips turn tan to brown in color and have black, pimple-like fungal fruiting structures dotting their surface. Protect plants from winter injury, drought, and other stresses. Apply a fungicide to protect plants.

How do you make arborvitae greener?

Experts recommend slow release granular fertilizer for arborvitae trees. The nitrogen in this fertilizer is released over a long period of time. This enables you to fertilize less often, and also ensures that the tree’s roots will not burn. Select a slow-release fertilizer that includes at least 50 percent nitrogen.

Do arborvitae like coffee grounds?

If you want to try adding coffee grounds to your arborvitae trees soil, we recommend against it. Although arborvitae enjoys slightly acidic soil, adding coffee grounds can alter your plant’s pH balance, causing root and growth issues.

Should you water arborvitae in the winter?

Arborvitae Winter Care You can prevent desiccation by watering the ground thoroughly all through the growing season, right up through autumn. Give the shrubs more water on warm days during the winter. Arborvitae winter care also includes a thick layer of mulch to protect roots. Use up to 4 inches (10 cm.).

Is Miracle Gro good for Arborvitaes?

Miracle-Gro Miracid Plant Food is designed to be used for acid-loving plants such as hydrangeas, azaleas, and rhododendrons; it is not appropriate for evergreens such as arborvitae. You can browse our other water soluble fertilizers here.

Should you mulch arborvitae?

Arborvitae ((Thuja occidentalis) benefits from mulch, too. Don’t skip this important cultural habit even with an established arborvitae plant. Select an organic mulch that decomposes and helps condition the soil. Grass clippings, bark mulch, shredded or chopped leaves or compost work well.

Should I clean out under arborvitae?

It is always beneficial to clean debris completely out of your conifers. If left there to decompose it shuts off air circulation and opens the door to disease. Needles that have fallen to the ground are OK and help retain moisture.

Why do my Arborvitaes keep dying?

The most common cause of arborvitae turning brown all over and dying is root rot caused by Phytophthora, a fungus which is widespread in local soils. Early in the process, when only one or several roots are affected, the portion of the tree they supply with water will die.

Do emerald green arborvitae need full sun?

Emerald Green Arborvitae thrive in full sun but can grow in partial shade as well. Too much shade will lead to sparse growth. To flourish, these trees need at least six hours of direct sunlight per day.

How much water does a Green Giant arborvitae need?

Moist soil is ideal for Thuja Green Giants, but people must be careful to not let the water get soggy. Thuja Green Giants require deep, irregular waterings of about 1 inch per week.

Why is my Green Giant turning brown?

If your Thuja ‘Green Giant’ is growing poorly, turning to reddish brown foliage, and seems to be dying, it could be root rot caused by soggy or saturated soil conditions. Let the soil line get a little dry between waterings. Water in the mornings so the soil has time to dry out during the day.

Why do Arborvitaes turn yellow?

The arborvitae plants often need a lot of water and can turn yellow if too little or too much water is given to them. If they are watered too frequently, and the soil is saturated, then that can cause waterlogging. Waterlogging can then lead to loss of roots as well.