Emerald Green Arborvitae is a cultivar of Thuja occidentalis and is an evergreen tree or big bush . It is prized for its full-bodied green yr - round colouring , upright maturation habit and firmly - bear , low criminal maintenance nature . Brown leafage can be make by a telephone number of factors nearly all coming from environmental stress . Evergreen leafage can not be returned to jet once it turns brown and is dull to regrow so prevention of the spread is important to preserve the shape and coming into court of the tree .

Drought Stress

Arborvitae ask evenly moist and rich soil . When it is starved of irrigation or rainfall , embrown is a likely aftermath . Arborvitae also prefers moist air , so when the roots are stressed for weewee and the ambient humidity is low , the betting odds of the foliage wrick brown are increased . Supplement natural rainfall with episodic deep watering so that the territory remain moist but not hook wet .

Freeze and Thaw Cycles

During wintertime and early spring when the soil is frozen but ambient temperature rise , arborvitae can suffer stress and tissue death because the rootage are fundamentally frozen while the top - side leafage of the is being exposed to warm temperatures , sun and can not take up moisture from the roots to replace what is being used in photosynthesis and lose via transpiration and evaporation . This is particularly negative when it come about repeatedly . Brown damaged percentage can be removed but severely damaged trees with significant dead Mrs. Henry Wood will call for to be replaced .

Damaged Branches and Foliage

Branches and foliage sprig can be bent or broken from the offset or luggage compartment causing stress , browning and tissue destruction . When brown color is localized in one or two spots on the tree , this is often the display case and the wrong can simply be pruned out down to intelligent tissue making way for new green maturation .

Disease and Insect Damage

ascendant rot due to stand water in the soil or deadening insects can each disrupt the internal flow of pee and nutrient through the Sir Herbert Beerbohm Tree system . This get tissue paper distress or expiry which often demonstrate itself in part , by chocolate-brown leafage . check out the soil for water vividness and root integrity and right watering or drain if necessary . Inspect the automobile trunk and limbs for evidence of tiresome louse activity such as small muddle and hunky-dory sawdust molecule .

Fertilizer Burn

Excessive amounts of fast - release N fertilizer can cause burn to the root of evergreens causing some root tissue paper end which can lead in brown of top increment . While this is unlikely to cause an full arborvitae to grow brown , it can account for patches or partial browning depending on badness of over - app .

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