Re: weeding-roundup
perennials@hort.net
  • Subject: Re: weeding-roundup
  • From: &* P* L* <1*@rewrite.hort.net>
  • Date: Tue, 7 May 2019 11:49:37 -0500 (CDT)
Like Joanie, I've also used horticultural vinegar (although mine is 30%), but 
with mixed results.  Some plants like thistle will brown and die immediately, 
but others (like established bishop's gout) won't do anything.

It seems like new growth is the most vulnerable, so I've found that cutting 
it back and then attacking the resulting shoots gives me the most success.  
You have to keep at it with a few applications, but I've never been 
disciplined enough.

This is the one I bought:

   https://www.amazon.com/gp/product/B00VVMTM14/

I just put it in a spray bottle and mist the plants.  

Chris

> I've had excellent results spraying with 20% agricultural vinegar.
> You can get quite close to treasured plants if you use a shield of
> some sort and only spray on a calm day. It sometimes takes 2
> applications but it gets the deal done on knotweed, etc. It
> dissipates rapidly from the soil. If you can't find it locally,
> amazon has it. Good luck!

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