Arborvitae Root Depth #360261 - Ask Extension

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Arborvitae Root Depth #360261

Asked September 06, 2016, 4:57 PM EDT

I planted 6 foot arborvitae in Washington county around 2006, They are now approximately 12 feet tall. How deep would the root system be today?

Washington County Oregon

Expert Response

Thanks for your question regarding arborvitae root system. The root systems of arborvitae are generally shallow depending on the variety and they may spread to the drip line edges of the branches.  The major root depth of a large arborvitae variety can reach 18-24 inches deep, while roots of a smaller variety such as Emerald Green, reach 8 inches deep.  Emerald Green is popular locally, it has a pyramidal form growing to height of 10-15 feet by 5 feet wide, making it much smaller than the species.  
Marcia Grubb Replied September 12, 2016, 5:52 AM EDT

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