Eryngium alpinum 'Blue Star' – The sculptural Alpine sea holly with an unprecedented blue hue

Eryngium alpinum 'Blue Star', known in English as the Alpine sea thistle, is a true eye-catcher in the garden thanks to its vivid blue, spiny flowers and elegant, architectural form. This professional selection was specially developed for cut flower production, but comes into its own just as well in the ornamental garden. With its metallic sheen, silver stems, and striking texture effect, 'Blue Star' brings a modern, almost futuristic look to the border.
Combined with its drought tolerance, strong growth, and attraction to pollinators, this Eryngium is a perfect choice for those seeking a special, low-maintenance plant.

Vibrant blue, metallic bloom that instantly stands out

The flowers of Eryngium alpinum 'Blue Star' are among the most striking within the genus. The flower heads are spiny, thistle-like, and have an exceptionally vivid blue color ranging from bright cobalt blue to deep metallic blue.
This hue is further enhanced by the bracts (the finely serrated 'collar' around the flower), which also glow bright blue. As a result, the plant appears to almost glow in the sunlight.

The flowering habit is not only intensely colorful but also highly structured: the combination of spiky shapes, rigid lines, and metallic sheen creates a sculptural effect that instantly adds character to modern borders. The plant typically blooms in July and August, precisely the time when many gardens could benefit from additional pops of color.

Ideal for cut flower production

'Blue Star' was initially developed as a professional cut flower, and this is evident in several characteristics:

• Sturdy, straight silvery stems

• Long shelf life in vases

• Striking colour that lasts well

• Perfect shape for bouquets and flower arrangements

Even dried, the stems and flower heads retain much of their structure and hue, making them suitable for dried flower creations and decorative arrangements.

Sculptural elegance in the garden

In the ornamental garden, Eryngium alpinum 'Blue Star' adds a powerful, modern look. The thistle-like, spiny flowers contrast beautifully with lush, soft, or rounded plants.
Thanks to its silver-blue color, the plant fits perfectly into:

• Modern and minimalist gardens

• Prairie planting

• Rock gardens and gravel gardens

• Sunny borders with ornamental grasses

• Mediterranean vegetation

The plant reaches a height of about 70 to 90 cm, which makes it suitable for the middle of the border, where it combines colour and structure without being overpowering.

Drought tolerant, strong and low maintenance

Eryngium alpinum 'Blue Star' is ideal for gardeners looking for an easy-to-grow plant with maximum ornamental value. The Alpine sea holly loves full sun and well-drained, dry to moderately moist soil.
Once established, the plant is particularly drought-tolerant, making it an excellent fit for climate-resilient gardens.

Maintenance is minimal:

• Remove old stems in spring

• Provide a dry location

• Only water during prolonged drought in the first year

Furthermore, the plant is very winter hardy and comes back reliably every year.

A magnet for bees and pollinators

Besides its ornamental qualities, Eryngium alpinum 'Blue Star' is an excellent bee plant. The richly structured blooms attract:

• Bees

• Bumblebees

• Gliding

• Butterflies

The nectar production makes the plant particularly valuable in gardens where biodiversity plays an important role.

Why choose Eryngium alpinum 'Blue Star'?

• Intense metallic blue, thistle-like flowers

• Professional selection for cut flower production

• Sculptural and architectural structure

• Drought tolerant and low maintenance

• Attractive to bees and other pollinators

• Hardy and excellent for sunny borders

• Unique eye-catcher that enriches modern and natural gardens