Glaucium flavum
Glaucium flavum · Papaveraceae
The gardener's calendar
Ideal time to plant glaucium flavum: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Papaveraceae (poppies)
- Form
- Biennial or short-lived perennial herb
- Mature size
- 40 to 80 cm tall, 30 to 50 cm spread
- Flowering
- May to September, golden-yellow flowers
- Foliage
- Deciduous, blue-grey, finely cut and waxy
- Hardiness
- Down to −5 °C, tolerates moderate cold
- Origin
- Mediterranean coasts and Black Sea region
- Exposure
- Full sun, well-drained and dry
Care
Exposure and climate
Yellow horned poppy demands a spot in full sun for optimal flowering. It tolerates salt spray and appreciates dry, hot, well-ventilated situations, ideal for seaside or Mediterranean gardens. Plant it sheltered from strong winds to preserve its structure.
Soil and planting
Prepare well-drained, poor to moderately fertile soil, even gravelly. This plant dreads winter moisture and compacted clay soils. Improve drainage by adding sand or gravel if necessary. Planting is done in spring or autumn depending on your climate.
Watering
Water moderately and regularly during growth and flowering phases, then reduce after flowering. In dry Mediterranean regions, one or two waterings per week suffice in summer. Avoid water accumulation at the roots, which promotes rot.
Fertilizer and nutrition
Poor soil suits this species better; excess nutrients favor foliage at the expense of flowers. Light balanced fertilizer in spring is sufficient. You can also apply diluted fertilizer occasionally during flowering if the plant appears exhausted.
Pruning and maintenance
Pinch the tips of young plants to encourage branching. Remove spent flowers as they fade to prolong flowering. At season's end, cut back the plant if it becomes too leggy. Leave a few flowers to develop into long, spectacular seed pods.
Pests and diseases
Yellow horned poppy is rarely affected by disease if drainage is good. Watch for aphids and whiteflies indoors or under cover. Powdery mildew may appear in overly humid conditions; ensure good air circulation and avoid foliage watering. Root rot is the main threat: ensure dry dormancy in winter.
Did you know?
Yellow horned poppy was once cultivated along Mediterranean coastal roads as a forgotten plant in seaside gardens. Its elongated, wavy seed pods, which resemble horns or hunting horns, earned it picturesque regional names. It symbolizes resilience in the face of extreme coastal conditions, and remains a favorite of ecological gardeners seeking elegant and undemanding wildflowers.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Bleeding heartLamprocapnos spectabilis
- Corydalis flexuosaCorydalis flexuosa
- California poppyEschscholzia californica
- Opium poppyPapaver somniferum
- Solid-bulbed corydalisCorydalis solida
- Climbing corydalisCeratocapnos claviculata
Tips generated and checked by Viridia — adapt them to your local climate.