Giant Eryngo Plant Care
Eryngium giganteum M.Bieb.
Updated · Sources · How we source care data
Eryngium giganteum, with the common name Miss Willmott's ghost, is a species of flowering plant in the family Apiaceae.
Every 7–14 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Giant Eryngo?
Water Giant 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.
What Is the Giant Eryngo?
Giant Eryngo (Eryngium giganteum) belongs to the Apiaceae family within the Eryngium genus. Giant Eryngo is also known as Sea Holly.
Giant Eryngo displays an upright, clumping perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Giant Eryngo produces small, cone-shaped blue or white flowers surrounded by spiky bracts.
Leaf size: approximately 6 inches.
How Often Should You Water a Giant Eryngo?
Eryngium giganteum 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 Giant Eryngo Need?
Giant Eryngo thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Giant Eryngo Prefer?
Eryngium giganteum grows best at temperatures of 60–80°F. Giant Eryngo prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Giant Eryngo?
Well-draining sandy soil with good organic content. Good drainage is essential for Giant Eryngo to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Giant Eryngo?
Feed Giant 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 Giant 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 Giant Eryngo?
Giant 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 Giant Eryngo Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Giant 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 Giant Eryngo?
Giant 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 Giant Eryngo Need?
Giant Eryngo grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Giant Eryngo as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Giant 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.
Giant 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 giganteum M.Bieb., family Apiaceae (first published in Fl. Taur.-Caucas. 1: 201 (1808)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Giant 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.
- Hardiness zone: USDA Zone 13a, calculated from the plant's minimum temperature.
- 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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