Draw your yard on graph paper. Begin with the home's layout, including windows, patios, driveways and sidewalks. Add existing trees and shrubs. Consider the views from both the outside and the inside of the home.
Sketch possible placement of raised garden beds. Use curved lines for an informal style and straight lines for a formal appearance. For vegetable gardens, straight-edged beds are simpler to plant and maintain. Keep informal beds balanced but not identical: do not weigh down one side of the yard and neglect the other. Do not place beds under trees or around existing shrubs.
Lay out heavy twine or garden hose according to your sketch. Walk around the yard and view the potential beds from decks, windows and patios. Look for problems such as utility boxes, meter access, slow-draining areas and deep, dry shade from eaves. Consider sunlight at different times of the day. Redesign the beds as necessary.
Draw circles, ovals, or other symbols on the sketch of the raised beds to mark placement of various flowers. Keep mature plant size in mind; place taller plants toward the back of each bed. Note bloom times, sun and water requirements or special needs of the plants. Plan groups of herbaceous flowers rather than individual plants that clutter the flowerbed. Use odd numbers of plants, like three day lilies or five salvia, to prevent an artificial appearance.
Cut down any vegetation within the new bed. Dig along the edge of the bed with a half-moon edger or a shovel. Rake the dirt toward the bed's center. Add soil and compost, if necessary, until the bed is at the desired height. Beds 6 inches tall or less do not require side support, according to Purdue University. Smooth the top of the bed and water it to settle the soil. Most beds settle to half their height.
Set potted nursery plants on the raised bed, following your sketch. Adjust the plants as desired, then plant them. Add 2 to 3 inches of mulch to prevent erosion and retain soil moisture.