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Details
Iridescent bright blue, spiny, thistle-like Sea Holly blooms from July to September making superb cut flowers, fresh or dried. Its shimmering, metallic blue stems and eclectic blooms add unique textural and visual interest to gardens and are beloved by floral creatives for fresh or everlasting arrangements. Established plants in sunny, well-drained locations are rewarded with more robust blooming each year. Despite its thistle-like, prickly foliage necessitating care during harvest, it's a pollinator magnet, drought, and poor soil-tolerant.
Michigan Seeds and Plants grown on our farm, Renegade Acres, in Howell, MI!
Certified Organic by Oregon Tilth.
Additional Info
| Botanical Name | Eryngium maritimum |
|---|---|
| Life Cycle | Perennial |
| Min. Time to Germinate | 5 Days |
| Max. Time to Germinate | 3 Months |
| Depth to Sow Seeds | Surface Sow; press seeds gently into the soil to make good contact, but do not cover with any additional soil; these seeds require light to germinate |
| When to Sow | Late Summer, Early Fall |
| Minimum Seed Spacing | 1" |
| Growing Height | 18-24 in. (45-60 cm) |
| Plant Spacing | 15-18 in. (38-45 cm) |
| Hardiness | USDA Zone 4a: to -25F, USDA Zone 4b: to -20F, USDA Zone 5a: to -15F, USDA Zone 5b: to -10F, USDA Zone 6a: to -5F, USDA Zone 6b: to 0F, USDA Zone 7a: to 5F, USDA Zone 7b: to 10F, USDA Zone 8a: to 15F, USDA Zone 8b: to 20F, USDA Zone 9a: to 25F, USDA Zone 9b: to 30F |
| Sun Exposure | Full Sun |
| Danger | Plant has spines or sharp edges; use extreme caution when handling |
| Bloom Color | Dark Blue, Light Blue, Medium Blue |
| Bloom Time | Mid-Summer |
| Foliage | Blue-Green, Silver/Gray, Smooth-Textured |
| Other Details | Drought-tolerant; suitable for xeriscaping |
| Soil pH Requirements | 6.1 to 6.5 (mildly acidic), 6.6 to 7.5 (neutral), 7.6 to 7.8 (mildly alkaline) |
| Propagation Methods | By dividing the rootball |
| Seed Collecting | Collect seedhead/pod when flowers fade; allow to dry |
| Seeds Per Pack | 50 |
