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Suitable for containers

Cut Flower


Attracts Butterflies

Attracts Hummingbirds

Winter Hardy

Deer Resistant

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Sea Holly

Eryngium alpinum 'Blue Star'

Lacy dark blue thistle-like flowers bloom atop long strong stems.

Sea Holly features open umbels of steel-blue prickly flowers, which are a favourite for cutting, fresh or dried. This superb selection features large bristly flowers on strong stems, in a rich metallic blue shade. A versatile plant, fitting well into the sunny border. Tolerant of hot, dry sites once established. Flowers are attractive to butterflies. For dried use, cut stems just as the first few flowers in each umbel are almost fully opened: hang upside down in a dark, warm room to dry. Divide plants in spring every 3 to 4 years.


Bloom Time:

Blooms summer

Mature Height:

28-32 In

Hardiness Zone:

3-9 Find your zone


Full Sun

Features and Usage:

Greenhouse Growing Instructions:

Grow at 55-65° F keeping soil on the drier side until new growth appears. Once actively growing keep evenly moist, allow to dry a little in between watering, and fertilize accordingly. Plants generally finish in 8-10 weeks based on growing conditions.
Plants Per Gallon: 1
Storage Temperature Prior to Planting: 38
Cooler Humidity Prior to Planting: Low

Transplanting Instructions:

Plant in well draining professional potting soil; spread out roots within pot leaving crown just at the soil surface. Water immediately and apply a broad spectrum fungicide according to directions to avoid crown and root rot.

Homeowner Planting and Maintenance Tips:

Plant in well-drained soil in full sun. Good selection for dry flower arrangements.

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We have done our best to describe this plant as accurately as possible, however, different climates
and growing conditions in different parts of the country will affect height, bloom time, and color.