"Rick Hughes" wrote
I bought in 30 tonne of top soil last year, and noticed the mini hill, has
now sprouted a thick layer of Horsetail.

What is the best way to kill this ... I will not be growing anything on
this soil for at least another 2 years .. so can afford to use something
strong on the stuff.

A quick Google around suggests that a Glyphospahte (Roundup or Tumble
weed) or Dichlobenil (Casoron G) product should work ?

Anybody any experience of how good these are on Horsetail ?


On the Glyphospahate solution, a couple of posts mention 'Glyphosphate
Professional' is there much difference, or is this just a different
dilution ?


Personally having gardened on an allotment with it I would certainly go back
to the person that sold me the infected soil and complain bitterly.
This weed has a waterproof coating and is therefore very difficult to
eradicate even with chemicals, also the thin black roots go down too far to
dig it out and just a small bit will regrow. I rate it worse than Japanese
Knot Weed because that is easier to kill.
I noticed some weedkiller at a GC recently that was a sticky gel and it says
it kills Horsetail and Ivy so give that a go.
Best of luck, you'll need it.

--
Regards
Bob Hobden
17mls W. of London.UK