Sea Holly

Sea Holly

Sea Holly (Eryngium) is a bold and architectural perennial known for its spiny, thistle-like flowers in shades of blue, silver, and purple. Blooming from early to late summer, the striking flower heads are surrounded by metallic-looking bracts that give the plant a dramatic, sculptural appearance. Its silvery-green foliage and upright form make Sea Holly a standout in modern gardens, coastal landscapes, and mixed perennial borders.

Highly adaptable and exceptionally drought-tolerant, it thrives in full sun and poor, well-drained soil where many other plants struggle. It attracts bees and butterflies while remaining resistant to deer and rabbits. Sea Holly also makes an excellent cut or dried flower, retaining its color and form long after harvest. Once established, it is low-maintenance and long-lived, offering consistent performance year after year with minimal care.

Care Instructions

Planting:
Plant Sea Holly in full sun in well-draining soil. Space plants 18–24 inches apart to allow for mature size and airflow.

Watering:
Water regularly during the first growing season to establish roots. Once established, Sea Holly requires little supplemental watering and prefers drier conditions.

Pruning:
Deadhead spent flowers to maintain appearance or leave blooms for winter interest. Cut back stems in late winter or early spring before new growth begins.

Pest Control:
Sea Holly is generally pest-free and resistant to deer and rabbits. Occasional aphids may appear but rarely cause serious damage.

Soil Tips:
Prefers sandy, rocky, or gravelly soil with excellent drainage. Avoid rich or heavy soils, as excess fertility can reduce flowering and cause floppy growth.