35+ Arborvitae Brown Tips. There are a few times in the year and in the tree's life that it's more susceptible to browning. Knowing the cause of brown arborvitae is an important step in preventing it.
By the following spring, the leaves and twigs are hollowed out and break.
The tree is nice and full and healthy looking otherwise. If the whole tree is browning, think about water — too much or too little. There are a few times in the year and in the tree's life that it's more susceptible to browning. When arborvitaes start to turn brown there are several possible causes, and these are frequently difficult to sort out.