Yellow Horned Poppy
Glaucium flavum
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Full Sun
Zones
5, 6, 7, 8, 9
Water
Low
Humidity
Low
Lifespan
Biennial or short-lived perennial
Native To
Coasts of Europe and the Mediterranean
Toxicity
All parts are toxic if ingested.
The Story
Plant Bio
Glaucium flavum, commonly known as yellow horned poppy, is a perennial herbaceous plant distinguished by its grey-green, lobed foliage and striking, bright yellow, horn-shaped flowers that bloom in the summer. This species is notable for its silky, greyish foliage and its ability to thrive in poor, sandy soils, making it a hardy choice for drought-prone gardens.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into well-draining soil in early spring.
- Mist cuttings lightly to encourage root development.
- Water regularly until established, then reduce watering.
- Fertilize with a balanced, low-nitrogen fertilizer in spring.
- Divide plants every 3-4 years in early spring for best growth.
- Mulch around the base to retain moisture and suppress weeds.
Pro Tip
Ensure excellent drainage to prevent root rot and promote healthy growth.
Keep It Thriving
Care Guide
Do
- Water sparingly once established 💧
- Deadhead spent flowers to encourage more blooms 🌸
- Apply a light mulch to maintain soil moisture
Don't
- Overwater to avoid root rot ❌
- Use heavy, clay-based soil without amendments ❌
- Neglect pruning or dividing
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Propagate | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Yellow Horned Poppy questions
What zones can Yellow Horned Poppy grow in?
Yellow Horned Poppy is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Yellow Horned Poppy deer resistant?
Not reliably. Deer may browse Yellow Horned Poppy, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Yellow Horned Poppy bloom?
Yellow Horned Poppy typically blooms in summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Yellow Horned Poppy need full sun?
Yellow Horned Poppy does best in full sun (6+ hours).
Is Yellow Horned Poppy drought tolerant?
Yes — once established (usually after the first full season), Yellow Horned Poppy handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
Keep exploring
Explore the genus
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Grow Yellow Horned Poppy with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
