On Mar 19, 5:03*pm, "Tahi" wrote:
Do glyphosate based weedkillers only affect green tissue? In other words can
I carefully spray the ground elder without seriously affecting the big
mature tree paeony growing in the middle of it?

Not sure what kind of sprayer you're using but if you use one with a
proper herbicide nozzle (sometimes called a flood jet) it sprays a fan
shaped sheet rather than a hollow cone of droplets. Less drift with
the herbicide nozzle and easier to see where it's going. If you can,
work against the light, then you can see a little 'rainbow' of
drifting droplets at the edge of the fan - that's what you need to
keep a sharp eye on.
I would be extremely careful about spraying very close to a tree
paeony. Don't forget Glyphosate is translocated so hitting ground
elder leaves a few inches from your paeony may be sufficient to see
the weed off safely or at least weaken it enough to make manual
removal quite easy.

Rod