On Wed, 19 May 2004 07:56:42 -0400, "Bert" wrote:

Put in a barrier.

A clumper does not spread but does expand and over time will exceed your
assigned area.

The only barrier I would recommend for long term containment is a min. of 4"
of reinforced concrete. All of the plastic barriers on the market are made
for tree roots and the longest manufacturers guarantee I have found is 15
years and this is a new product that has never been tested on bamboo however
it has channels that direct the tree roots down which is a no no for bamboo.

Rent a trencher, cut a trench 3 feet deep and fill with concrete reinforced
with rebar or wire mesh and your bamboo will be contained for the next 30 to
50 years. You will need to go in and dig out part of it every so often to
keep it in top shape.

In the area you have allowed the plant will probably never reach the rated
height because there is not sufficient area to develop the root mass
necessary to store the energy to put up the rated height.

Don't forget about keeping an eye on that bamboo even after you put the barrier
in. I have 7 kinds of bamboo growing now, and some of them can be sneaky. If it
can't sneak under a barrier it will sometimes try to sneak over the barrier.