Question From: R. Boman - Sammamish, Washington, United States
Q: Hi Nancy, I have I believe Pyramidalis arborvitae's that are 24 years old along both sides of my driveway. About 2 years ago the first one died and now several more have died even though the fertilized and watered them. The ones on the side of the driveway that had more sun are the ones that are dying. Is it possible they have reached their lifespan? Perhaps they were planted too close together. I want to replant but need to make sure the disease is not in the soil and would kill the new plants.
A healthy arb can live anywhere from 40 to 150 years in an urban setting. Spider mites are the biggest problem and can kill these trees. They are especially troublesome in times of drought. There are soil borne diseases that will kill arbs. Seek the services of a certified arborist for assistance. To find one in your area go to www.tcia.org. Best And Happy Yardening, Nancy