Large-flowered Horn Poppy Plant Care
Glaucium grandiflorum Boiss. & A.Huet
Updated · Sources · How we source care data
Glaucium grandiflorum, the great-flowered horned poppy, is a species of flowering plant in the horned poppy genus which is native to the Middle East.
Every 7–10 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Large-flowered Horn Poppy?
Water Large-flowered Horn Poppy every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
Where Is the Large-flowered Horn Poppy Native To?
What Is the Large-flowered Horn Poppy?
Large-flowered Horn Poppy (Glaucium grandiflorum) belongs to the Papaveraceae family within the Glaucium genus. Large-flowered Horn Poppy is native to the Middle East.
Large-flowered Horn Poppy displays an upright, branching perennial growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Large-flowered Horn Poppy produces bright orange to yellow poppy-like flowers.
Leaf size: approximately 6 inches.
How Often Should You Water a Large-flowered Horn Poppy?
Glaucium grandiflorum requires watering every 7–10 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 7–10 days
Let soil partially dry between waterings
What Light Does the Large-flowered Horn Poppy Need?
Large-flowered Horn Poppy thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Large-flowered Horn Poppy Prefer?
Glaucium grandiflorum grows best at temperatures of 50–80°F. Large-flowered Horn Poppy prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Large-flowered Horn Poppy?
Well-draining sandy soil with good organic content. Good drainage is essential for Large-flowered Horn Poppy to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Large-flowered Horn Poppy?
Feed Large-flowered Horn Poppy 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 Large-flowered Horn Poppy?
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 Large-flowered Horn Poppy?
Large-flowered Horn Poppy can be propagated through seeds, division of rootball. Similar propagation techniques also apply to yellow horned poppy plant care, which shares the same genus.
Is the Large-flowered Horn Poppy Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
Toxic to humans and pets
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 Large-flowered Horn Poppy?
Large-flowered Horn Poppy is susceptible to aphids, slugs, snails. 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 Large-flowered Horn Poppy Need?
Large-flowered Horn Poppy grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Large-flowered Horn Poppy is native to the Middle East. In cooler regions, grow Large-flowered Horn Poppy as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Large-flowered Horn Poppy 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 Glaucium genus — compare its care with other Glaucium species on PlantoScan.
Glaucium is part of the Papaveraceae plant family — browse all Papaveraceae genera and species.
Large-flowered Horn Poppy thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Glaucium grandiflorum Boiss. & A.Huet, family Papaveraceae (first published in Diagn. Pl. Orient. , ser. 2, 5: 15 (1856)) — World Flora Online record, IPNI name record.
- Pet toxicity: Large-flowered Horn Poppy is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, 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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