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Use weed-suppressing landscape fabric to cover the whole bottom of the garden box from side to side. Make sure the fabric extends right to each side of the the wooden frame.  For example, for a standard 4 ft (1.2 m) by 8 ft (2.4 m) garden bed, you need to get a piece of landscape fabric that is at least that big. Landscape fabric usually comes in rolls that are at least 3 ft (0.91 m) wide, and you should be able to get the amount you need cut to size at a garden center so that you don't need to buy a whole roll. This will keep weeds from sprouting up from the ground soil and into your garden. Use about 3-4 2 sq ft (0.19 m2) bags each of compost and planting soil. Pour it all into the garden bed and mix it together with a garden fork or spade. You can get planting soil and compost in bags or in bulk at a garden center. Buying in bulk is usually cheaper. Use a rake to even out the top of the soil so it is more or less flat and either flush or just below the top edge of the garden box frame. Lightly spray the whole top layer of soil with water from your garden hose to tamp down the soil. Your garden box is now ready for you to plant your vegetables!
Cover the bottom of the bed with a layer of landscape fabric. Fill the bed with a 50/50 mix of planting soil and compost. Rake the soil smooth and spray it with a hose to settle it.