On Sun, 3 Mar 2013 21:15:38 -0000, Roger Tonkin
wrote:

A patch of my garden borders a field which is covered
in couch grass. The field is being sold, and is no
longer home to any animals.

During this short hiatus, I would very much like to
murder the edge of the field's couch grass. Given that
grass is not growing very quickly at present, and I
need a quick solution, can anyone suggest a
product/method that would do the job - preferably
without leaving a harmful residue that could affecy
animals.

Glyphosate is AFAIK your only option, probably with a couple of repeat
treatments. There is no selective weedkiller that is effective on
couch.

Downside is that if, say, you killed a metre border around the field,
in a couple of years couch in the remainder would have grown and be
invading your territory again.

Cheers, Jake
=======================================
Urgling from the sensible end of Swansea Bay where the ground is
drying out nicely and the pond is back where it ought to be.