In message , Steve
Harris writes
In article ,
(Franz Heymann) wrote:

I prefer to just use the glyphosate at its recommended strength and
patiently wait for it to do its job. Admittedly 2 applicationa are
sometimes necessary, spaced by about a fortnight.

The effects of glyphosate are often slow. Maybe a month to kill many
things. However, many treated plants look very slightly sick after about
a week.

And against bindweed you want it to be slower still so that the poison
has time to translocate along more of the plant roots before the stuff
dies off. Too strong and only the tops die without affecting the roots.

The only plants I have found in the garden that almost resist glyphosate
are holly seedlings and some buttercups. YMMV

Regards,
--
Martin Brown