This is a "warning" post. I had planted a row of these about 4 years ago, with the intention of blocking out the neighbor behind us. Our 6 foot privacy fence, on a slope, was only about 5 feet in reality. True to their information, they do grow extremely fast and provide excellent privacy. Within 3 years they were about 15 feet tall.
Unfortunately, we spent last summer trying to exterminate them. The roots are VERY invasive. I found a
on Feb 04, 2013
They are great if you have an orchard and use them as a wind bluff I've heard.
When I was little there was one tree in the yard of the house my parents bought and YES, very difficult to kill. Nice memories though