Discover Perfect Sea Holly Companion Plants for Your Garden

Are you looking to add some unique beauty to your garden with sea holly? This plant is known for its striking blue flowers and spiny leaves, making it an excellent choice for those who want something different from the usual blooms. But what kind of plants can you pair with sea holly to create a harmonious garden? In this post, we'll explore some of the best sea holly companion plants that will enhance your garden's appeal.

The Best Sea Holly Companion Plants

1. Lavender

Lavender is an excellent choice to pair with sea holly because they share similar growing conditions. Both plants thrive in full sun and well-draining soil, making them a perfect match. Lavender complements sea holly's blue flowers with its purple blooms, creating a soothing color scheme. Additionally, the scent of lavender attracts beneficial insects like bees, which will help pollinate your garden.

How to grow Lavender with Sea Holly?

To grow lavender and sea holly together, plant them in a sunny spot with well-draining soil. You can also use a raised bed if your soil is heavy or poorly draining. Water both plants regularly but avoid overwatering, as they both dislike wet feet. Prune your lavender regularly to keep it from getting too woody and leggy, and deadhead spent flowers to encourage more blooms.

2. Catmint

Catmint, also known as Nepeta, is another great plant to pair with sea holly. They both enjoy full sun and well-draining soil, and catmint's lavender-blue flowers complement sea holly's blue blooms. Catmint is also a low-maintenance plant that attracts pollinators like bees and butterflies to your garden.

How to grow Catmint with Sea Holly?

Plant catmint and sea holly together in a sunny spot with well-draining soil. Water regularly but avoid overwatering, as both plants dislike wet feet. Deadhead spent flowers to encourage more blooms, and prune catmint back in late summer to keep it from getting too leggy.

3. Russian Sage

Russian sage is a hardy perennial that pairs well with sea holly. This plant enjoys full sun and well-draining soil, making it an excellent match for sea holly. Russian sage has a light purple-blue flower that complements the blue of sea holly, and its silvery-grey foliage adds texture to your garden.

How to grow Russian Sage with Sea Holly?

To grow Russian sage and sea holly together, plant them in a sunny spot with well-draining soil. Water regularly but avoid overwatering, as both plants dislike wet feet. Prune Russian sage back in early spring to promote new growth, and deadhead spent flowers to encourage more blooms.

4. Black-Eyed Susan

Black-eyed Susan, or Rudbeckia, is a bright yellow flower that pairs well with sea holly's blue blooms. This plant thrives in full sun and well-draining soil, making it a great choice to grow alongside sea holly. Black-eyed Susan attracts pollinators like bees and butterflies to your garden, making it a beneficial addition.

How to grow Black-Eyed Susan with Sea Holly?

Plant black-eyed Susan and sea holly together in a sunny spot with well-draining soil. Water regularly but avoid overwatering, as both plants dislike wet feet. Deadhead spent flowers to encourage more blooms, and cut back black-eyed Susan in late summer to promote new growth.

5. Salvia

Salvia, also known as sage, is a popular companion plant for sea holly. This plant enjoys full sun and well-draining soil, making it an excellent match for sea holly. Salvia has many different varieties, including purple, pink, and white, so you can choose the one that complements your sea holly best.

How to grow Salvia with Sea Holly?

Plant salvia and sea holly together in a sunny spot with well-draining soil. Water regularly but avoid overwatering, as both plants dislike wet feet. Deadhead spent flowers to encourage more blooms, and prune salvia back in late summer to keep it from getting too leggy.

Frequently Asked Questions (FAQs)

1. Can I plant sea holly in shade?

No, sea holly requires full sun to thrive. Plant it in a spot that gets at least six hours of direct sunlight each day.

2. How often should I water sea holly?

Water sea holly regularly, but avoid overwatering. Allow the top inch of soil to dry out between waterings.

3. Can sea holly survive winter?

Yes, sea holly is a hardy perennial that can survive winter in most regions. However, it's essential to provide good drainage and protect the roots from freezing temperatures.

4. How tall does sea holly grow?

Sea holly can grow up to 3 feet tall and 1 foot wide, depending on the variety.

5. Can sea holly be used in cut flower arrangements?

Yes, sea holly's unique blooms make it a popular choice for cut flower arrangements. The flowers can last up to two weeks in a vase.



Sea holly is a beautiful plant that can add unique beauty to your garden. Pairing it with the right companion plants can make it even more striking. Lavender, catmint, Russian sage, black-eyed Susan, and salvia are all excellent choices to grow alongside sea holly. Remember to choose plants that enjoy similar growing conditions and complement sea holly's blue blooms. With these tips, you can create a harmonious garden that's sure to impress.