Prepare the planters before any new plantings to keep the process simple. Pull up any weeds or old foliage and throw out exposed rocks and litter. Rake the planters to provide a flat, even surface.
Lay pages from old magazines over the soil to cover it. Stack the magazine pages five to six layers thick to provide better coverage. The paper blocks sunshine and keeps weeds from growing up into the garden.
Build a new soil foundation on top of the magazines for planting. Lay 5 to 6 inches of organic compost and topsoil on the site for a moist, nutritious foundation, and add 10-10-10 or 5-10-10 fertilizer for starting vegetable or flower nutrition.