Photo: no rights reservedCC0 1.0via iNaturalist
Blue Eryngo Plant Care
Eryngium planum L.
Updated · Sources · How we source care data
Eryngium planum, with its spiky, metallic blue flowers atop silvery-green leaves, originates from Europe and Western Asia. Its unique appearance and ability to attract pollinators such as bees and butterflies make it a highly coveted addition to the collection of plant enthusiasts.
Every 7–14 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Blue Eryngo?
Water Blue Eryngo every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Blue Eryngo Native To?
- Afghanistan
- Albania
- Austria
- Belarus
- Belgium
- Bosnia and Herzegovina
- Bulgaria
- Croatia
- Cyprus
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Ireland
- Italy
- Kazakhstan
- Kyrgyzstan
- Latvia
- Lithuania
- Luxembourg
- Malta
- Moldova
- Montenegro
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Russia
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- Tajikistan
- The Netherlands
- Turkmenistan
- Ukraine
- United Kingdom
- Uzbekistan
What Is the Blue Eryngo?
Blue Eryngo (Eryngium planum) belongs to the Apiaceae family within the Eryngium genus. Blue Eryngo is native to the area that includes central and southeastern Europe and Central Asia. Blue Eryngo is also known as Blue Sea Holly, Plano Eryngo.
Blue Eryngo displays an upright, clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Blue Eryngo produces small, cone-shaped blue or white flowers surrounded by spiky bracts.
Leaf size: approximately 6 inches.
How Often Should You Water a Blue Eryngo?
Eryngium planum requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Blue Eryngo Need?
Blue Eryngo thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Blue Eryngo Prefer?
Eryngium planum grows best at temperatures of 60–80°F. Blue Eryngo prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Blue Eryngo?
Well-draining sandy soil with good organic content. Good drainage is essential for Blue Eryngo to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Blue Eryngo?
Feed Blue Eryngo every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Blue Eryngo?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Blue Eryngo?
Blue Eryngo can be propagated through seeds, division of offsets. Similar propagation techniques also apply to alligator weed plant care, which shares the same genus.
Is the Blue Eryngo Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Blue Eryngo, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Blue Eryngo?
Blue Eryngo is susceptible to aphids, spider mites, powdery mildew. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Blue Eryngo Need?
Blue Eryngo grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Blue Eryngo is native to the area that includes central and southeastern Europe and Central Asia.
Hardiness Zone
Zone 5a – 9b
Keep exploring plants
Blue Eryngo is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Eryngium genus — compare its care with other Eryngium species on PlantoScan.
Eryngium is part of the Apiaceae plant family — browse all Apiaceae genera and species.
Blue Eryngo thrives in bright light and direct sun — see other bright-light plants.
More Eryngium Species
Other Eryngium species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Eryngium planum L., family Apiaceae (first published in Sp. Pl. : 233 (1753)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Blue Eryngo, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Public domain, CC0 1.0, iNaturalist — original.
- Hardiness zone: USDA Zone 5a – 9b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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