A raised flowerbed allows the soil to drain faster and to warm up earlier in the spring for a longer growing season. You also do not have to bend as far, so weeding and other maintenance chores are easier. A raised flowerbed can be attractive, easy to maintain and versatile. You can add a trellis for vining plants, or hoops made of PVC pipe to support frost cloth during cold weather. Build a raised flowerbed with two-by-fours to custom-fit your garden.
Choose a location for the raised flowerbed and decide how big it will be. A width of 4 feet is easy to maintain from both sides without having to stretch.
Hoe and rake away the grass and weeds from the area. You also could mow the grass and weeds as short as possible and cover the area with black porous landscape cloth.
Cut the 8-foot board into 2 pieces, each 4 feet long. Cut the remaining two boards to the desired length of the raised flowerbed, if they are not the correct length already. Form a box shape with the boards in the area cleared for the flowerbed.
Stand two boards on their narrow edges and join the ends together to form a corner. Drill several 3.5- or 4-inch decking screws through both boards to hold them securely. Repeat this process with the other three corners.
Place the box in the position you want it. If it is not level, add some soil under the lower side of the box or remove some soil from under the higher side.
Fill the box with potting soil or topsoil, compost and any other amendments you want to use.