Ciscoe Morris, Seattle's Channel 5 NBC gardening guru suggests spot
spraying with straight vinegar. Especially on a hot sunny day. Within in
days you can pull those dead grassse up, stir up the soil, add a little
more lawn soil and reseed. Early spring and fall best time to do this.
It works on weeds and grasses coming up in cracks on the sidewalk. I
have a 20 ft or longer area covered with lava rock that abuts next to
the street. I spray the length of it with straight vinegar every now n
then to keep weeds down. This won't kill any seeds weeds have left
behind so have to keep at it.
Yes, the ag extension guy said pre-emergent applied again late summer
would help control it. Of course it won't stop what's there from
spreading by rhizomes. I got rid of the worst spots that I had couple
of weeks ago with Roundup.
I think mine came from some shade mix I used. It's confined to three
areas I seeded couple years ago. On the web, looks like contamination
has been a problem, particularly for grass mix for wet/shady areas, as
that is the environment it likes.
If what you have is poa trivialis, it should disappear with hot, dryer
I didn't know pre-emergent herbicide could read a calender.... someone
better tell preen. :)
Know what too much will do? Root prune the desirables.
Like I told you before your extension guy did, timing is critical with that
approach. Too soon can root prune, and too late won't work. You'll still
end up with some of it.
OK, I see it now. I think what had me confused was I didn't know it
was poa trivialis until 2 days ago and was thinking of the discussion
in the context of what works specifically for that. When we were
discussing it before, no one knew what it was, but the advice you gave
does work as one of the avenues of attack for this too.
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