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Glossy leaves, stellar blue flowers, quick coverage -- periwinkle is an ideal coverage for shade. Its only flaw is that it's so popular it's become underappreciated.
Prepare the soil well prior to planting and add humus to retain moisture. Keep the plants cut back to encourage bushy growth, and to keep them within bounds. Periwinkle can become invasive.
Part Sun, Shade, Sun
Under 6 inches to 3 feet