Just plain white vinegar, non-toxic to the environment, but deadly for weeds.
The struggle is real, isn't it?!? This is the most effective all-natural weed killer DIY that we use. It's even been featured on Hometalk and pinned thousands of times! Hope this helps! Hugs, Holly
PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean
White vinegar 1:1 with water kills in a couple of days OR boiling water that kills instantly (but isn't long term)
This article is really helpful