Horsetails - how to get rid off once n for all

[Mosaic]

Over 30 years ago I accidentally imported horsetails (those christmas tree weeds) into the garden in horse manure.
Every year I spend hours rooting the little b's out. I try every chemical spray I can. Does anyone have any tips and tricks to get rid of the blighters?

[Buenchico]

From the Royal Horticultural Society:
http://apps.rhs.org.u.../profile.aspx?pid=257
(Basically, it seems to say keep on using the chemicals until either the weed, or you, finally gives up!)

[Mosaic]

I feared this might be the case Chris - thanks anyway.

[rowanwitch]

before you use weed killer go through them giving them a bit of a bash with a bunch of canes as the silica in their outer layer stops the weedkiller penetrating and bruisng them a bit gives it a chance of getting in

[boxtops]

Good luck - they are the very devil to get rid of.

[welshlibranr]

have been trying to get rid of this weed for mor than the years, no chance!.....It's been around for thousands of years, and will be for thousands more too I think!...........It's indestructable!.........believe me, I have tried!.............it's still here!...........