Stubborn weeds: if they have long or deep roots (couch grass...) use a
*lower* concentration, and treat more than once.

The reason is that the weedkiller takes time to get to the parts other
weedkillers don't reach, and you don't want the top growth to die till it
gets there.


"Bob Minchin" a écrit dans le message de
...
A 1 litre container of 360gm/l concentrate claims to treat 3000 sq metres

so that is 120mg per sq metre. The amount of water you use really depends
on the method of application so long as you deposit the required amount of
GF.
More stubborn weed need higher concentrations so you can scale up
accordingly.
hth
Bob

Pete C wrote:
Having read the post about GF in France, I wondered what the
concentration should be for actual 'effective' use........Gm/Lt ?