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PlantFiles: Globe Thistle
Echinops ruthenicus 'Platinum Blue'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Echinops (EK-in-ops) (Info)
Species: ruthenicus (ru-THEN-ih-kus) (Info)
Cultivar: Platinum Blue

Synonym:Echinops ritro subsp. ruthenicus

2 vendors have this plant for sale.

3 members have or want this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

15-18 in. (38-45 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
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)

Sun Exposure:
Sun to Partial Shade

Parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction

Bloom Color:
Medium Blue

Bloom Time:
Mid Spring
Late Spring/Early Summer

Grown for foliage

Other details:
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors
From seed; sow indoors before last frost

Seed Collecting:
Unknown - Tell us

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By Equilibrium
Thumbnail #1 of Echinops ruthenicus by Equilibrium

By Terry
Thumbnail #2 of Echinops ruthenicus by Terry

By Terry
Thumbnail #3 of Echinops ruthenicus by Terry

By AnniesAnnuals
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Thumbnail #5 of Echinops ruthenicus by AnniesAnnuals


No positives
1 neutral
1 negative

Gardeners' Notes:

Negative jerry31557 On Oct 6, 2009, jerry31557 from Patterson, GA wrote:

This plant is VERY invasive. Seeds will scatter everywhere if not dead headed and a lot of time even if you do. The seed pods are also VERY thorny to the touch. I would not go within a mile of this one.

Neutral berrygirl On Mar 5, 2007, berrygirl from Braselton, GA (Zone 7b) wrote:

Handsome plants have silvery stems and a mound of foliage. Straight stems with beautiful ball-shaped, mid-blue flower heads. A classic for cut flower arrangements and unmistakable when grown in the perennial border or as specimen plants. Plants thrive in sun and well-drained soil. Blooms July and August. Perennial, 3-4' tall.


This plant has been said to grow in the following regions:

Richmond, California
San Francisco, California
Buckfield, Maine
Foxboro, Massachusetts
Saint Paul, Minnesota
Murfreesboro, Tennessee
Kalama, Washington

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