Eryngium, Alpine Eryngo, Alpine Sea Holly 'Amethyst'

Eryngiumalpinum

Family
Apiaceae (ay-pee-AY-see-ee)
Genus
Eryngium (er-RIN-jee-um)
Species
alpinum (AL-pin-um)
Synonym
Sun Exposure
Full Sun
Sun to Partial Shade
Foliage
Herbaceous
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)
Danger
N/A
Bloom Color
Chartreuse (yellow-green)
Blue-Violet
Lavender
Bloom Time
Mid Summer
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Grow outdoors year-round in hardiness zone
Bloom Characteristics
Flowers are good for cutting
Flowers are good for drying and preserving
Bloom Size
Other details
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
Regional

This plant is said to grow outdoors in the following regions:

Menifee, California

San Jose, California

Clermont, Florida

Mount Prospect, Illinois

Mason, Michigan

Jackson, New Jersey

Ithaca, New York

Alsea, Oregon

Provo, Utah

Seattle, Washington

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Gardener's Notes:

2
positives
0
neutral
0
negative
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L
Ithaca, NY (Zone 5b) | November 2004 | positive

I have just planted this form of sea holly this spring (04) after obtaining bare root plants from an online nursery. I planted in rich w...Read More

K
K
Mount Prospect, IL (Zone 5a) | July 2003 | positive

I love this drought-tolerant plant. However, my understanding (and experience in moving one) is that this plant has a tap-root, which wo...Read More

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