Choose a sunny location with good water drainage for rocks and flowers as many rock garden plants thrive in a full six to eight hours of sunlight a day. According to the Colorado State University Extension, sloped terrain is best for rock garden designs.
Dig a hole for each rock and bury approximately one-third of the rock into the soil. You can use almost any pattern for the rocks that's pleasing to you. Natural, random placement of rocks can be beautiful.
Choose plants that will grow well among rocks. Some common rock garden perennial flowers include alyssum, rockcress, Carpathian harebell, bellflower, bluebell, yellow sulfur flower, dwarf iris, sun daisy phlox and citrina.
Plant your chosen flowers around the rocks, leaving the flowers some room to spread. If you have chosen your plants well, they should easily grow over and around the rocks.
Do not over-water rock gardens as many of these plants prefer well-drained, slightly dry soil. Fertilizer needs will depend on the variety of flowers you plant, so research each plant to become familiar with its individual needs.