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Eryngium ‘Big Blue’
(Sea Holly)



Out of stock

Great for wildlife
June - August
75cm x 50cm
Attracts Wildlife
Fully Hardy

‘Big Blue’ commands attention with its unique spikes. Standing at 75cm, this spiky perennial makes a bold statement in sunny spots. Its unique form suits contemporary or cottage-style landscapes, contrasting beautifully with softer textures. ‘Big Blue’ adds drama and is adored by our horticultural team.

Additional information

Plant Type
Flowering Period
Flower Colour
Fully Grown Size
Garden Position
Light Level
RHS Plants For Pollinators
RHS Garden Merit Award
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Eryngium 'Big Blue' commands a regal presence in our curated selection, meticulously chosen by our horticultural experts for its captivating beauty, accolades, and ecological significance. This perennial jewel, bedecked with striking blue blooms, proudly holds both the RHS Award of Garden Merit and the RHS Plants for Pollinators award, showcasing its exceptional performance and role in promoting biodiversity. This spiky superstar is here to make a unique statement in your garden with its striking appearance. Standing tall and proud, Eryngium 'Big Blue' showcases a multitude of spiky bracts surrounding its thistle-like flowers. Selected for its unrivalled visual impact, 'Big Blue' graces the garden with tall spikes of majestic blue blooms from late Spring to early Summer. Its adaptability to diverse soil types and light conditions makes it accessible for all gardeners, while its average height of 75cm renders it an impactful and versatile addition to those bright and sunny spots in your borders or mixed plantings. This extraordinary Eryngium fits seamlessly into a range of garden designs, adding a touch of drama to contemporary or cottage-style landscapes. Whether nestled within perennial borders, rock gardens, or coastal landscapes, 'Big Blue' makes a bold statement. Its spiky, architectural form contrasts beautifully with softer textures and complements a variety of plant companions, creating dynamic and visually appealing garden compositions. Our team adore the uniqueness and easy care nature of Eryngium 'Big Blue' and it transforms your garden into a haven of beauty, biodiversity, and versatile design possibilities.

Planting Conditions

Eryngium 'Big Blue' thrives in sunny locations and well-drained soil. It prefers soil with a slightly alkaline to neutral pH but can tolerate a range of soil types, including sandy or rocky soils. Ensure the planting site receives at least six hours of direct sunlight per day for optimal growth and flowering. When planting, dig a hole slightly larger than the root ball and back-fill with well-amended soil, gently firming it around the plant's base. Water thoroughly after planting to settle the soil. With the right planting conditions, Eryngium 'Big Blue' will flourish and become the rockstar centrepiece of your garden.

Watering & Feeding

Eryngium 'Big Blue' has moderate water needs. Water the plant regularly, especially during hot and dry periods, to keep the soil evenly moist. However, avoid over-watering, as it can lead to root rot. As a low-maintenance plant, it typically doesn't require frequent feeding. However, you can provide a balanced, slow-release fertiliser in early Spring to give it a nutrient boost. Follow the package instructions for the recommended dosage and application method. Remember, Eryngium 'Big Blue' is adaptable and can tolerate nutrient-poor soils, so focus more on maintaining proper watering habits to ensure its health and vitality.

General Care

Eryngium 'Big Blue' is a low-maintenance plant that thrives in sunny locations and well-drained soil. Once established, it is drought-tolerant and can handle some neglect. Deadhead the spent flowers to promote continuous blooming and remove any damaged or yellowing foliage. This spiky superstar is generally resistant to pests and diseases, but keep an eye out for any signs of trouble. In colder regions, provide a layer of mulch to protect the plant during Winter. Overall, Eryngium 'Big Blue' is a tough and resilient performer that will rock your garden with its unique charm and require minimal care along the way.