I tried this last year: it works! How to make an inexpensive non-toxic homemade weed killer to control weeds in your garden: 1 gallon of white vinegar cup salt Liquid dish soap (any brand) Empty spray bottle
Baking soda neutralizes the ph in the soil and is a natural weed killer. Sprinkle baking soda around all of the edges of garden areas to keep the grass and weeds from growing into flower beds. Just lightly cover the soil twice a year – spring and fall.