Plant October Skies Aromatic Aster in full sun with well-drained soil. Space plants 18-24 inches apart. Water regularly during the first growing season to establish a deep root system. Once established, water only during prolonged dry periods. Fertilize in early spring with a balanced, slow-release fertilizer. Pinch back stems in late spring to encourage bushier growth and more blooms. Deadhead spent flowers to prolong blooming. Divide clumps every 2-3 years in early spring to maintain vigor.