Traditional farming uses rows in the ground raised a few inches above grade, with valleys between. This is an excellent, time-tested method for large-scale farming, but for the small-scale homeowner type there are several advantages in using raised beds including smaller space.
Baking soda neutralizes the ph in the soil and nothing will grow there. Sprinkle baking soda lightly around all of the edges of flower beds to keep the grass and weeds from growing into beds. Do this twice a year—spring and fall.