Eryngium Species, Miss Willmott's Ghost, Giant Sea Holly
Eryngiumgiganteum

Family: Apiaceae (ay-pee-AY-see-ee)
Genus: Eryngium (er-RIN-jee-um)
Species: giganteum (jy-GAN-tee-um)

Synonym:Eryngium asperifolium

Synonym:Eryngium haussknechtii

Category

Perennials

Water Requirements

Drought-tolerant; suitable for xeriscaping

Sun Exposure

Full Sun

Foliage

Herbaceous

Foliage Color

Unknown

Height

36-48 in. (90-120 cm)

Spacing

12-15 in. (30-38 cm)

Hardiness

USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
USDA Zone 8a: to -12.2 °C (10 °F)
USDA Zone 8b: to -9.4 °C (15 °F)

Where to Grow

Unknown

Danger

Plant has spines or sharp edges; use extreme caution when handling

Bloom Color

Dark Blue
Silver/Gray

Bloom Characteristics

Flowers are good for cutting
Flowers are good for drying and preserving

Bloom Size

Unknown

Bloom Time

Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall

Other details

Unknown

Soil pH requirements

6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information

Non-patented

Propagation Methods

From seed; direct sow outdoors in fall
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting

Allow seedheads to dry on plants; remove and collect seeds