CAMPANULA rotundifolia. Bluebells. This perennial bellflower occurs in higher mountains of much of the northern hemisphere, including California. It forms a low hummock of vegetative shoots with mostly pointed oval leaves. In summer and fall airy 6-10" stems rise from the foliage to display many small, nodding lavender-blue to violet bells. A fine rock garden and container plant. Sun, many soils, moderate to regular watering. Hardy to 0^oF. or less.