You can use salt water but not if you want to grow anything else in that spot. It works well for drive way crack weeds.
This article looks at all the common natural weedkillers and is really helpful
Hi Jasmine - 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! 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