The trees are small right now, about 2 1/2 to 3 foot tall. The trees are 10 to 12 feet tall and seem to be doing well, except for the side facing the road. The best way to achieve this is simply to turn your hose on and leave the open end at the base of your tree for 10 minutes every few days in the hot summer. includes five species of coniferous evergreen trees and shrubs used widely in landscaping to add winter color. A neighbor lost a small evergreen shrub recently from what looked to me to be disease or insect damage which has me concerned. These arborvitae diseases mostly emerge in the rainy season. Sprinklers never work as well as a deep soak. Sorry I couldn't be any more descriptive but any help about what flying insects might be attracted to these would be helpful. Arborvitae (Thuja spp.) Recently, we noticed that one of them looks pretty much dead and the one next to it is heading there. This may be true even for well-established trees. Winter sun, wind and cold temperatures can bleach and dry out evergreen foliage, damage bark and injure or kill branches and roots. Road Salt Damage to Arborvitae. Last year there was a small amount of leaf loss due to snow. Browning on arborvitae leaves can occur at various times of the year. They are the variety that is supposed to grow either 10 or 15 feet I think, not the really huge ones. I noticed that my dog urinates on them? Sometime ago, you mentioned the salt on the roads during the winter posing a problem. When it happens in summer, the color change could be happening because of drought.But if your arborvitae shrub turns brown in winter or early spring, the likely reason is winter burn. We planted 10 Arborvitae's. As with most trees, arborvitae are used to climate changes and will acclimate to lower temperatures. The Reason Why Arborvitae Foliage Turns Brown . However, if a sudden cold spell hits the tree before it is done adjusting, the weather can freeze the plant tissues and make your tree sickly or kill it completely. New trees need to be watered deeply for the entire first season after planting. The disease produces fungus, which is traveled within the tree through the rain water pours thereby, creating an infection in the bark of the tree and kills the defensive tissues of the arborvitae by germinating them. Last fall, we planted a staggered row of arborvitae along the road as a natural fence line about 4 to 6 feet from the road. These trees get surrounded by a lot of snow. Could this be killing them? Since arborvitae are so green, many people forget to water their newly planted trees.

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