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Growing Guide: How to Grow Eryngium

Growing Guide: How to Grow Eryngium

Eryngium: A Striking Perennial for Your Garden

Eryngium, also known as Sea Holly, is a stunning perennial that will add a touch of wow-factor to your garden. Imagine silvery-blue foliage and unique, spiky blue flowers with bright green centers attracting butterflies and bees - that's Eryngium! It's a valuable addition to any pollinator-friendly garden. Plus, the contrasting blue-grey foliage adds a touch of architectural interest to borders and rock gardens.

Planting and Care:

Eryngium thrives in well-drained soil and loves basking in the sunshine. However, it's a bit of a trooper and can tolerate some part shade as long as the soil drains well. Remember, good drainage is key for this plant, so if your soil is heavy clay, consider amending it with some sand or gravel before planting. These plants can grow up to 3 feet tall and 2 feet wide, so give them enough space (around 18 inches apart) to spread out their roots and reach their full potential.

Planting Your Bare-Root Eryngium:

These easy-to-care-for perennials arrive as bare roots, ready for you to plant. Here's a quick guide:

  1. Before planting, give your Eryngium a good soak! Submerge the bare roots in water for 3-6 hours to rehydrate them and give them a head start.
  2. Dig a hole deep enough for the roots to settle in comfortably, without feeling cramped.
  3. Place the Eryngium in the hole, making sure the crown (where the roots meet the stem) sits slightly below the soil surface. Aim for a depth of about 1-2 inches.
  4. Refill the hole with soil and gently firm it around the plant to remove any air pockets. Then, give it a thorough watering to settle the soil and hydrate the roots.


  • Especially during the first growing season, water your Eryngium regularly, but let the soil dry slightly between waterings.
  • Once established, you won't need to water as often. Eryngium is quite drought tolerant and will only need a drink during extended dry periods.

Additional Tips:

  • Eryngium is a low-maintenance plant and doesn't require constant feeding. However, a light application of slow-release fertilizer in early spring can be a nice treat.
  • The dried flower heads retain their beauty well into winter, adding visual interest to your garden even in the colder months. You can leave them on the plant for winter decoration or cut them for dried flower arrangements.

By following these tips, you can enjoy the beauty and low-maintenance appeal of Eryngium in your garden for years to come!

Meet Ben, our Flower Bulb Specialist
Meet Ben, our Flower Bulb Specialist

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Buy Bare Root Eryngium Jos Eijking
Buy Bare Root Eryngium Jos Eijking