Lay a garden hose around the cluster of granite boulders, creating a kidney-shaped outline of a planting bed. Shift the hose as needed to include all the boulders into a bed with gently curving edges. Keep the hose -- the bed edge -- at least 24 inches away from the boulders.
Mark the edges of the bed by digging up small bits of soil or lawn where the garden hose edging rests. Once the entire bed is marked on the soil, according to the location of the hose, remove the hose and prepare the area for labor-intensive landscaping.
Remove all lawn or other undesired plant materials from inside the newly formed planting bed around the boulders. Place debris into a wheelbarrow for easy clean-up and removal to a dump site or waste bin.
Purchase low-growing plants to cover the ground and among the large boulders. Visit the garden center and ask the staff for help selecting appropriate plants for your project that meet the soil and light conditions in the planting bed.
Plant the vegetation around the planting bed. Sit the plants atop the soil and position and shift them as needed to create the best-looking landscape. Dig holes and plants only after you are set on where each plant needs to go.
Top-dress the soil after planting with a crushed granite gravel or an organic mulch. A 3- inch thick layer suffices. The gravel or mulch prevents weeds, conserves soil moisture and unifies the landscape bed with a good-looking ground cover.