On Tue, 24 Aug 2004 08:35:32 -0400, "madgardener"
wrote:

That was nine years ago. Every year I spot another tentative shoot of it
poking out of the immediate region of that eastern flowerbed. I carefully
pull it, trying to get as much root as I can

To the original poster, sell the place and move away. Either that, or
maybe nuclear weapons, but somehow I think the horsetail would even
survive that.