Eryngium Magical Blue Lagoon


2 in stock

SKU: eryngium-magical-blue-lagoon Category:
Common Name: Sea Holly
Size: 2-3 litre
Hardiness: H5
Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees ˚C) are shown in brackets

  • H1a: under glass all year (>15˚C)
  • H1b: can be grown outside in the summer (10 - 15 ˚C)
  • H1c: can be grown outside in the summer (5 - 10 ˚C)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5 ˚C)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1 ˚C)
  • H4: hardy through most of the UK (-10 to -5 ˚C)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10 ˚C)
  • H6: hardy in all of UK and northern Europe (-20 to -15 ˚C)
  • H7: hardy in the severest European continental climates (< -20 ˚C)
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2-3 Litre Pot

  • Position: Full sun
  • Soil: Well drained
  • Growth Rate: Average
  • Flowering Period: Summer
  • Hardiness: H5
  • Eventual Height: 0.5-1m
  • Eventual Spread: 0.1-0.5m

Eryngium Magical Blue Lagoon, commonly known as ‘Sea Holly’,  is a robust, clump forming perennial.  It is known for its striking purple-blue flowers and spiky, architectural foliage. This plant is a member of the Eryngium genus, which is native to Europe, Asia, and North America. The history of Eryngium goes back to ancient times, where it was used for medicinal purposes and as a source of food for both people and animals.

This Eryngium is a hardy and drought-tolerant plant that is easy to care for and maintain. Its spiky foliage creates an excellent contrast to other plants in the garden, making it an excellent choice for borders, rock gardens, or as a standalone specimen. The plant reaches a mature height of around 1 metre, which makes it a perfect choice for adding visual interest to any garden or landscape.  It is also loved by bees and other pollinates, making it an excellent addition to any garden.

How to care for your Eryngium Magical Blue Lagoon

  1. Planting: Prefers full sun and well-drained soil. When planting, be sure to amend the soil with compost or other organic matter to improve the drainage.
  2. Watering: Once established, it is drought tolerant and requires very little water. Water only when the soil is dry to the touch.
  3. Fertilising: It is not a heavy feeder, so fertilising is not necessary.
  4. Pruning: It is a self-cleaning plant, so pruning is not necessary. However, if you wish to keep the plant a certain size or shape, you can prune it back in late Spring or early Summer.
  5. Overwintering: It is hardy but in areas with harsh winters, it’s a good idea to mulch around the base of the plant to help protect the roots.

By following these simple care instructions, your Eryngium Magical Blue Lagoon will thrive and add beauty to your garden for many years to come.


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