Thuja Green Giants - Knowledgebase Question

Ashburn, VA
Question by nssu
September 25, 2006
I just bought 25 6.2 gallon Monrovia Green Giants from South Riding Nursery in South Riding, VA. We are going to have them planted This coming Saturday. I wanted to ask the following questions: 1) how fast we can expect these trees to grow 2) how far apart should we plant them. 3) are there any special planting instructions or can you recommend any how best to ensure a healthy and fast growing tree. How mature are the root systems on your 6.2 gallon Green Giants? Since this was a considerable monetary investment we want to feel good about paying extra for the Monrovia name. Any information to help us sucessfully plant and take care of these trees would be welcome. One other thing we have read that Thuja Green Giants turn a Bronze color in the winter? Is this true? Can you elaborate? How can we tell if natural or if the tree is not thriving. Thanks in advance for your assistance.

Answer from NGA
September 25, 2006


Green Giant will grow from 3 to 5 feet per year and will eventually grow to 50 feet or more with a fairly narrow spread. The color is a deep lustrous green and is pleasantly fragrant.

Green Giant will grow in a wide range of soils in zones 5 to 8 and prefers a deep well drained fertile soil although it adapts well to frequently saturated clay soils. This is a tough tree and will not easily suffer damage from high wind or heavy ice and snow loads.

Green Giant is drought tolerant after it is well established, exhibits no significant pest or disease problems, is deer and bagworm resistant and is hardy to -25F.

Plant 5 to 6 feet apart for a really fast privacy screen, otherwise 10-12 feet apart. Green Giant can be trimmed to any height and width.

The foliage remains green throughout the winter and Green Giant is not generally bothered by insect or disease problems.

Best wishes with your new Green Giants!

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