Plant Queen of Hearts Heartleaf Brunnera in partial to full shade. Ensure well-drained, consistently moist soil. Space plants 18-24 inches apart. Water regularly, especially during dry spells. Fertilize in early spring with a balanced, slow-release fertilizer. Remove spent flowers to encourage new blooms. Divide clumps every 3-4 years in early spring or fall to maintain vigor. Protect from harsh afternoon sun to prevent leaf scorch.