Baking soda neutralizes the ph in the soil and nothing will grow there. I use baking soda in a 6" wide area around all of the edges of my flower beds to keep the grass and weeds from growing into my beds. Just sprinkle it onto the soil so that it covers it lightly. I usually have to do this twice a year - spring and fall.
Amazing Organic Weed Killer Spray. 1/2 gallon of Apple Cider Vinegar 1/4 c table salt 1/2 tsp Dawn liquid dish soap Mix and pour into a spray bottle Spray weeds thoroughly. It makes 1/2 gallon for around $6.40 It worked better than Round Up & killed the weeds on first application. The Dawn dish soap strips the weed of it's protective oils so the vinegar can work with deadly force. Safe to use a yard used by pets
Natural Weed Killer 1 gallon vinegar, 1/2 cup salt, dash of dish washing detergent (makes it stick to the weeds). Mix well, spray on weeds in the morning, rejoice in their death that evening. This works best on a sunny day.