Alpine Sea Holly

Scientific Name: Eryngium alpinum

Common Name: Alpine Sea Holly 

Hardiness Zone: USDA Zones 4–9

Blooming Season: June to August

Plant Habit: Clump-forming, upright perennial

Characteristics: This cultivar features deep blue, thistle-like flower heads surrounded by spiky bracts, atop stiff, erect stems. The basal leaves are glossy and heart-shaped.

Water: Prefers dry to average moisture levels; drought-tolerant once established.

Fertilize: Generally does not require fertilization; thrives in poor to moderately fertile soils.

Spacing: Space plants about 24 inches (60 cm) apart to allow for proper air circulation and growth.

Height: 24–36 inches (60–90 cm)

Width: Approximately 24 inches (60 cm)

Exposure: Thrives in full sun; at least 6 hours of direct sunlight per day.