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.
Grow seedlings in recycled containers as greenhouses. Any clear plastic container will do. Use paper towel rolls or toilet paper rolls as a pot. When ready to plant, simply place the whole roll in the ground and plant.