Knowledgebase
Can you tell me about the root system of a Thuja Green Giant? #748857
Asked May 09, 2021, 10:08 AM EDT
Chittenden County Vermont
Expert Response
Hello Laura,
Thank you for your question. These are beautiful trees which grow quite tall and grow rapidly. My reading indicates they are 'robust and hardy'. They are a zone 5 tree, however, which means they object to temperatures going down to -20 degrees. I do not know where you live, but that is some additional information for you. My research indicates that root systems should not extend beyond 15 to 20 feet from the center of the tree, so your septic tank should be fine. Let us know if you have additional questions. Good luck!
Kathy Dodge, EMG
Hi.
Thank you so much for this reply. I am still trying to determine if this tree will be safe for my septic but I’m told Grand Isle Nursery may know more details.
Thank you again!
Laura
From: Ask Extension <<personal data hidden>>
Sent: Sunday, May 9, 2021 8:50 PM
To: Laura Scarpinato <<personal data hidden>>
Subject: Re: Can you tell me about the root system of a Thuja Green Giant? (#0018788)
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. The roots system grows deep, not reaching out.
I might be able to provide more definitive information by seeing a photo of where your septic is located and where you wish to plant.
I hope this additional info. is helpful.
Hi.
Thank you for this additional response.
I plan to contact Grand Isle Nursery later today with septic/root system questions as it is my understanding that they work with this tree a lot. If I am not able to get the information I need, I will reach back out to you with a photo and/or drawings of what I am trying to do/where I would like to plant these trees.
Thank you again!
Laura
From: University of Vermont <<personal data hidden>>
Sent: Tuesday, May 11, 2021 10:44 AM
To: Laura Scarpinato <<personal data hidden>>
Cc: Laura Scarpinato <<personal data hidden>>
Subject: Re: Can you tell me about the root system of a Thuja Green Giant? (#0018788)