Alpine sea holly 'Blue Star' (Eryngium alpinum 'Blue Star')

Alpine sea holly 'Blue Star'

Also known as: Sea holly 'Blue Star', Alpine thistle 'Blue Star'

Alpine sea holly 'Blue Star' is a colorful herbaceous perennial characterized by silver-blue, cone-shaped flowers above spiny, purplish basal bracts, all born by a grey-blue stem. The cultivar reaches around 70 cm in height and makes an interesting cut flower, both in the fresh and the dry form. The flower is attractive to butterflies.

Scientific classification

Carrots, ivies and allies

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Perennial

Lifespan

Herb

Plant Type

Summer, Fall

Bloom Time

Late summer

Harvest Time

80 cm

Plant Height

60 cm

Spread

Green, Blue

Leaf Color

2.5 cm to 5 cm

Flower Size

Brown

Fruit Color

Blue, Green

Flower Color

Care Guide for Alpine sea holly 'Blue Star'

Every week

Water

Full sun

Sunlight

0 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Alpine sea holly 'Blue Star' thrives in alpine conditions, requiring weekly watering while exhibiting drought tolerance. It prefers well-draining soil and cooler temperatures, typically growing outdoors in full sun, which supports its robust growth and enhances its striking blue flowers.

Fertilize: For alpine sea holly 'Blue Star', use balanced nutrition fertilizers monthly during the growing season with reduced frequency in winter. Avoid over-fertilization, adjusting feeding based on the plant's age. Young alpine sea holly 'Blue Star' need more frequent feeding, while established ones require less. Always follow label instructions and wear protective gear.

Pruning: Alpine sea holly 'Blue Star'' features striking blue flowers and silvery stems. Prune in spring to remove damaged stems and shape the plant. Cut back flowers post-bloom for growth and compactness, ensuring tools are clean to prevent disease. Avoid heavy pruning during active growth to reduce stress.

Propagation: Alpine sea holly 'Blue Star' is propagated by sowing seeds in well-draining soil, spaced for growth. Keep soil moderately moist during germination. After frost risk, transplant sturdy seedlings, ensuring regular watering without waterlogging. Acclimate them outdoors before planting in a sunny, well-ventilated spot.

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