Sea Holly


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Sea Holly has captivating spiky, silver-blue foliage that evokes the rugged beauty of seaside landscapes! Its spiky, thistle-like appearance and unique blue hues adds a touch of coastal charm to any garden. This 2-1/2' perennial is easy-to-grow, blooms all summer long, and can grow in almost any condition. Once established, it's heat and drought resistant, and staves off deer. Harvest and dry Sea Holly flowers for everlasting arrangements, wreaths, or crafts. The dried blooms retain their color and form exceptionally well.

Also Known As: Blue Sea Holly, Blue Glitter Holly, Big Blue Holly, Eryng, Blue Eryngo, Flat Sea Holly, Sea Holly, Sea Star Thistle, Star Thistle, Beach Eryngo, Blue Eryngo.

We ship in 1 business day. Shipped with USPS First Class Mail.

Plant Name:
Sea Holly
Latin Name:
Eryngium planum
Days to Germinate: 7-14
Days to Bloom: 110
Plant Height:
2 - 3 Feet
Bloom Diameter:
2 Inches
Growth Habit: Upright
USDA Zones: 4-10
Lifespan: Perennial
Brand: TomorrowSeeds
Sunlight: Full Sun, Partial Shade
Heirloom, Open-Pollinated
Seeds Packed For*: 2024

*Seeds are freshly packed for the growing season of the year listed. Seeds are still viable beyond pack date. Store in a cool and dry location such as the refrigerator or basement to best preserve germination rates.

Planting Instructions:


Soil Preparation:

Remove weeds, large rocks, and litter from the planting area. Till the soil 8-10 inches deep and rake several times to break up large clods. It is best to do this when the soil is dry enough to not stick to garden tools. Loosening the soil will help the plant establish strong roots.


Plant 1/4 inch deep in late Fall or early Spring after a killing frost. Sea Holly flower seeds can be directly sown in the garden anytime between late Fall and early-Spring. If planting after Spring planting, cold stratification will be needed for to seeds break dormancy and initiate germination. Mix the seed with moist sand and store it in the refrigerator for 30 days before direct sowing. When sowing, cover lightly with loose soil then sprinkle with water. Keep moist until established.

Planting Depth: 1/8 inch
Within-Row Spacing:
18 inches
Between-Row Spacing:
2 feet