Thuja Green Giants - Are They Really a Fast Growing Tree?
Thuja Green Giants are touted as a fast growing tree on the commercial market
. Let's see if they really live up to this adoration.
At my nursery, we have grown and sold the Thuja Cedar Green Giants for almost 10 years. The plants are hybrids so they are propagated by cuttings as they will not come back true from seed. Often we field transplant some of the cuttings to grow on for other projects. When field transplanting, we typically use Cedar Green Giant liners that are 6 to 8 inches tall. By the end of the first growing season, the field plants generally vary from 10 inches to 30 inches tall. At the end of the second summer, heights often reach 22 to 40 inches.
Arborvitae are a slow growing plant variety (generally less than 12 inches per year of new growth), which is why I believe when this crossed hybrid was found to be a more rapid grower, it become the "spokestree" for the variety. From my own experience, I haven't seen the extreme of 5 feet of new growth per year on this plant as noted in many advertisements.
About 4 years ago, I lined the entrance of my drive with over 100 green giants (18 inches tall). Being far away from the house, I was not able to regularly water them as they needed and, to make the situation worse, the soil was extremely compacted. After the stressing through their first year planted and having to survive a drought, they pulled through amazingly and I only lost 2, which, alone is pretty impressive. Today the green giants that line my drive are now roughly 6 to 8 feet tall.
Thuja Green Giants, as my drive way example describes, will grow in the poorest of soil. However, compacted soil does seem to stunt their growth considerably. If you have compacted soil, till the area deeply mixing in bags of aged compost or aged manure mix and coarse sand, going down as deep as possible (at least 12 inches deep). This will work to help with drainage and instantly put nutrients back into the soil. Then, plant the green giants. Giving them the best possible start for growing is always the best encouragement.
For the first year, apply supplemental water as necessary to keep the soil cool and moist. Apply shredded bark mulch around each plant going out at least 20 inches from the base of the plant leaving a welled area of about 3 to 4 inches at the base of the plant so that the bark does not touch the trunk of the plant. This welled area is for watering and air circulation.
Their first year in the ground the plants will work to develop a stronger and deeper root system. Fertilizing is not recommended during this time as it encourages more top growth rather than root expansion. Any top growth during this time is a plus, but don't expect it as this will not happen to any extent until the following year.
The green giant grows a little differently. Where most arborvitae grow as a whole, this one sends up a vine looking leader from the top. This leader hardens off and over the next few years it begins to build the tree around itself sending up the leader again each year. A little odd, but you will see what I mean.
While I am not a fan of seeing this plant advertised as a tree that puts on amazing growth each year, these are beautifully shaped conical trees that can be used for hedges, privacy screens and even as specimen trees. Understand that it will not grow as quickly as faster growing deciduous trees do, but appreciate its uniqueness and you will not be disappointed. While it many only grow a up to a few feet each year once established, as an evergreen, it would be considered a rapid grower.
Thuja Green Giants - Are They Really a Fast Growing Tree?
By: Cheryl D. Jones
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