David J Bockman wrote:
Willows are waterpigs, they will definetely be attracted to the pool
and
pipes.

How do they know there's water inside the pipes, or beyond the concrete?
Wouldn't the roots grow just as much in the other direction - maybe even
more if there was no resistance? What attracts them to the pool and
pipes? Smell? Visuals survalence from the branches, passed to the roots?
Can you fool them to think there's water in the oposite direction?

--
Warren H.

==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Blatant Plug: Black & Decker Landscaping Tools & Parts:
http://www.holzemville.com/mall/blackanddecker