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Botanical Interests

Steel Blue Sea Holly Seeds

Steel Blue Sea Holly Seeds

$2.69
$2.69
~0.4 g (~320 seeds)
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Product Details

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.

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  • Variety Info
  • Sowing Info
  • Growing Info

Variety Info

Family: Apiaceae

Native: Europe and Asia

Hardiness: Perennial in USDA zones 5–9

Exposure: Full sun

Bloom Period: Summer to frost

Plant Dimensions: 24"–48" tall

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

Attributes: Attracts Pollinators, Cut Flower, Drought Tolerant, Heat Tolerant, Deer Resistant, Rabbit Resistant

Sowing Info

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"

Growing Info

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.

4.7
Rated 4.7 out of 5 stars
Based on 12 reviews
Total 5 star reviews: 9 Total 4 star reviews: 2 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 0
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12 reviews
  • Uyen T.
    Rated 5 out of 5 stars
    Apr 23, 2024
    5 Stars

    It only grew leaves the first year, then it bloomed the second year. Wow!

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  • Chris S.
    Rated 5 out of 5 stars
    Mar 1, 2024
    5 Stars

    These were last year’s Sea Holly Steel Blue. They are just starting to germinate. It took 6 days! I did place in zip bag and in fridge for a few weeks. They say that hat doesn’t work that way unless they are on soil, but I think it helped.

    They are doing well! Look forward to having this plant again!

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  • Ashley M.
    Rated 5 out of 5 stars
    Jul 21, 2023
    5 Stars

    Wow! These are amazing!!! They didn’t do much the first year, but I’ve been abundantly impressed on year two! They’re easily 4’ tall & just keep getting better & better.

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  • Janice
    Verified Buyer
    Rated 4 out of 5 stars
    May 9, 2022
    4 Stars

    The small seedlings were planted last fall. They've grown well. I'm waiting for them to flower.

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  • Christine
    Verified Buyer
    Rated 5 out of 5 stars
    May 9, 2022
    5 Stars

    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.

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