Check this out. The first season, this put out 13 culms, of equil hight, to the existing culms at that time. The next season, it did nothing at all due to stress. This season its biggest culm is triple the hight of the previous growth. I counted 8 culms, the tallest being slightly over 4 feet.

http://postimage.org/image/yxhmckdf5/

http://postimage.org/image/6zxef4dm9/

The russian olive in this pic, is just under 6 feet tall, by a few inches

http://postimage.org/image/5ou8ke7e9/

Its a pretty good bamboo, on par as hardiest ones.

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Lance Kleckner
http://www.bigfootwillow.com