On 14/08/2013 21:41, Rick Hughes wrote:
On 12/08/2013 10:52, Windmill wrote:
Does anyone know how long glyphosate takes to kill various weeds?
E.g. elderberry bushes, dockins, brambles, bracken, grass?

Don't want to waste money by spraying again if it's premature to do so.

Been trying to kill off Mares Tail with Glyphosphate ........ almost
zero impact

There is a very waterproof layer of silica on the outside of marestail
that makes them totally impervious to weedkiller. You have to bruise it
slightly before the weedkiller can have any effect at all. The roots go
so deep and store so much energy that you will find it easier to move
house than to eliminate this weed once it is established.

Only a concerted effort of chemical and physical attack so that no part
of it ever sees daylight for long stands any chance at all.

--
Regards,
Martin Brown