5 Uses for Baking Soda to benefit the Garden. Use as a herbicide to kill crabgrass. Use as a pesticide to control cabbage worms. Use as a foliage rejuvenator for black spots. Use as a fungicide for powdery mildew. Use as a soil amendment for tomatoes. Click photo for link to mixtures & directions...
Baking soda and weeds ... A safe way to keep weeds and grasses from growing in the cracks of your paved patios, driveways, and walkways: Sprinkle handfuls of baking soda onto the concrete and simply sweep it into the cracks. The added sodium will make it much less hospitable to dandelions and their friends. Try it 2x/yr, spring and fall. Site has other ways to kill weeds.
Baking soda neutralizes the ph in the soil and nothing will grow there. use baking soda around all of the edges of flower beds to keep the grass and weeds from growing into beds. Just sprinkle it onto the soil so that it covers it lightly. Do this twice a year - spring and fall.