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. Awesome!
Coffee Grounds as a Fertilizer: If you are looking to add a garden bed, build up an existing one, or just repair a section of the garden, coffee grounds can used in all these cases. All that needs to be done is for the coffee grounds to be mixed in with soil, at a ratio of 50/50, and it is then ready to be added to the garden. A good soaking in is required after this, and then leave the whole thing to settle in for a few days before adding plants or seed to the new soil.