On 17 Aug, 23:37, "Emrys Davies" wrote:
My friend no longer has the energy to dig up the roots of Mare's Tail
and he is wondering if there is a chemical which will effectively
eradicate the menace.

It is very difficult.
People have frequently suggested bruising the plant, and then applying
glyphophate weedkiller. It will take loads of applications to do it.

On GQT they have suggested using a glove dipped in the filthy stuff
and running it over the plant. You do need, of course, a rubber glove
inside it because you DONT want it on the skin. Not sure about that.

The structure of the plant is very difficult to permeate, hence the
extreme suggestions.

I smothered mine out with old carpet over several years.

get a goat /and stop it eating anything else/ - mark you, that is
harder work than digging.