On Mon, 06 Mar 2006 14:50:26 GMT, Jasbird wrote:

... After spraying weeds and grass with paraquat - how long is it
... before one notices whether it has worked? And what happens to
... the plants? Do they turn yellow first? My plants don't look any
... different to how they did 2 days ago when they were sprayed.

What sort of ground temperatures have you?
If it is working, four days should see a difference

Mike P