Eryngium, Alpine Eryngo, Alpine Sea Holly
Eryngiumalpinum 'Amethyst'

Family: Apiaceae (ay-pee-AY-see-ee)
Genus: Eryngium (er-RIN-jee-um)
Species: alpinum (AL-pin-um)
Cultivar: Amethyst

Category

Perennials

Water Requirements

Average Water Needs; Water regularly; do not overwater

Sun Exposure

Full Sun
Sun to Partial Shade

Foliage

Herbaceous

Foliage Color

Unknown

Height

24-36 in. (60-90 cm)

Spacing

18-24 in. (45-60 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)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)

Where to Grow

Grow outdoors year-round in hardiness zone

Danger

N/A

Bloom Color

Chartreuse (yellow-green)
Blue-Violet
Lavender

Bloom Characteristics

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

Bloom Size

Unknown

Bloom Time

Mid Summer

Other details

Unknown

Soil pH requirements

6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information

Non-patented

Propagation Methods

By dividing the rootball
By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed