Plant Spring White Moss Phlox in well-drained soil with full sun exposure. Space plants 12-18 inches apart. Water regularly during the first growing season to establish a deep, extensive root system. Once established, water only during extended dry periods. Fertilize in early spring with a balanced, slow-release fertilizer. Trim back after flowering to maintain shape and encourage dense growth. Divide clumps every 2-3 years in early spring or fall to prevent overcrowding.