Obsidian Coralbells thrive in partial shade and require well-draining soil enriched with organic matter. Water consistently, allowing the soil to dry slightly between waterings to prevent root rot. Prune faded flower stalks to encourage new blooms and maintain a tidy appearance. Fertilize in early spring with a balanced, slow-release fertilizer to support healthy growth. Divide clumps every 3-4 years to rejuvenate the plant and promote vigorous growth.