"Martin Brown" wrote in message
...

[snip]

A few very tough weeds with large deep roots and small tough waxy leaves
can survive it (and for some reason buttercup is partially resistant).

[snip]

Glyphosate is ever so slow in action compared to paraquat. I use both
according to my mood, and (because of my impatience?) I usually have to
apply glyphosate twice before the weeds keel over.

Does paraquat really put paid to a plant, root and all, or does it only
interfere temporarily with the photosnthesis in the leaves?

[Franz Heymann]