Steel Blue Sea Holly Seeds


3.5 out of 5 stars
(4 reviews)
Availability: In Stock

Sea holly brings extraordinary architectural beauty to the garden by day, and wonderment at night as it reflects the silvery moonlight. It blooms profusely through the summer, attracting pollinators and providing garden interest in winter with long-standing blooms. Cut flowers are captivating in fresh or dry arrangements. This tough plant thrives in poor soil, heat, and drought, and even tolerates salty soil as found in coastal areas. Perennial in USDA zones 5–9. Deer and rabbit resistant.

$1.89 400 mg (~320 seeds)

Botanical Name: Eryngium planum

Family: Apiaceae

Native: Europe and Asia

Hardiness: Perennial in USDA zones 5–9

Plant Dimensions: 24"–48" tall

Variety Information: ½"–1" flower heads made up of many tiny flowers start out green and turn to silvery-blue as the flowers open.

Exposure: Full sun

Bloom Period: Summer to frost

Attributes: Attracts Pollinators, Cut Flower, Drought Tolerant

When to Sow Outside: Sow in fall or late winter.

When to Start Inside: RECOMMENDED: 10 to 12 weeks before your average last frost date. Ideal soil temperature for germination is 70°–75°F.

Days to Emerge: 7–90 Days

Seed Depth: Press into surface

Seed Spacing: A group of 3 seeds every 18"–24"

Thinning: When 1" tall, thin to one every 18"–24"

Special Care: For optimal germination, stratify sea holly seeds. Stratification is the process of subjecting seed to moist, cold treatment to break dormancy, which occurs naturally when seed is sown outdoors in fall. When starting seed indoors in spring, sow the seed into a container of moistened seed-starting mix, cover with clear plastic wrap, and leave the container in a refrigerator for 2 to 3 weeks, then move to a room temperature location to germinate. Keep soil evenly moist.

Harvesting: For longest vase life, harvest in the morning and change vase water frequently. For Drying: Harvest flowers when they are green; they will resist turning brown over time.

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Steel Blue Sea Holly Seeds Reviews

4 reviews

Steel-blue they are!

5 out of 5 stars Aug 13, 2020
One of the best plants I have ever grown, these Steel-blue Sea Holly are aptly named as the buds go from a vivid purple-blue to steel blue and attract all kinds of grateful pollinators in a spectacular display of attraction. What a show; they are abuzz with life once the word gets out. I have grown these for many years and can't imagine a mid-late summer display without them in my zone 6 garden. Mine grow 4 feet tall and have the most beautiful rosette of leaves with some pointy tips just like a holly only more dramatically shaped. The goldfinches mob the drying seedhead clusters for forage for their young. The Steel-blue Sea Holly is a gift to your garden pollinators and to yourself if you love a bit of drama and highly unusual and very rare steely-blue color. I love them.
Christine from PA
Owner Response: Wow! Thanks for sharing. Now we all want to grow these even more!

dissappointed, but liked the flowers

3 out of 5 stars Sep 30, 2021
Out of about 20 plants that germinated, only four of them produced flowers the first season. I tried them in several different locations in the garden, hot full sun and part afternoon shade. Most of the plants were healthy looking, I am hoping for lots of flowers next year.
Gloria from OR
Owner Response: Hi Gloria, It is normal for perennials to take 2 growing seasons to flower. It sounds like the seeds performed well, but just need more time.


5 out of 5 stars Oct 5, 2021
I was happy to see some of these blooming already as they were started in the spring.
Inge from CO

Not Happy

1 out of 5 stars Oct 12, 2021
None of the seeds germinated
Ronnie Bowen from SC
Owner Response: We are sorry you had difficulty germinating these seeds. A customer service agent will contact you by email to help. Rest assured, our seeds are tested by a third-party laboratory to ensure germination rates meet federal and our own standards. We are always happy to help troubleshoot issues you so can get that same, great germination.

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