Glaucium flavum, or Glaucium luteum, or Glaucium flavum f. flavum is also known as the Hornpoppy, Horned Poppy, Yellow Horned Poppy, Caillichín na trá, Bruiswort, Seaside Poppy, or Sea Poppy. It usually grows close to the sea therefore the common name Sea Poppy. It is part of the Papaveraceae family of plants.
This short-lived perennial is usually grown as a biennial. It is native to North Africa, Macaronesia (a collection of 4 archipelagos in the Atlantic Ocean northwest of Africa), Caucasus, Europe, and Western Asia.
It was first noted in 1763 by Heinrich Johann Nepomuk von Crantz (1722-1799). He was a physician and a botanist. He was born in Luxembourg and died in Austria. The name “flavum” from Latin means “yellow” and signifies its flower color.
Glaucium flavum forms a rosette of bluish-green foliage that is deeply segmented. It has gray stems that are branched. The orangish-yellow flowers have a similar structure to the Red Poppy. But the sepals are not hairy. Glaucium flavum flowering season is in the summer continuing to early autumn.
After flowering, it produces longhorn shaped capsules. These capsules chambers are full of seeds. The capsules can be as long as 30cm or 1ft. Glaucium flavum can grow up to 90cm or 3ft.
Glaucium flavum plants and seeds are toxic. It is drought-resistant. It is disease-free and pest-free.
Grow Glaucium flavum in the sun. Plant it in moderately fertile or even poor soil but it needs to be well-drained, located under the full sun. Usually doesn’t like to be moved around or roots disturbed.