Yellow horned-poppy

Found on the beach: the yellow horned-poppy (Glaucium flavum), a distinctive coastal plant, easily recognised by its vivid yellow flowers and long, curved seed pods. Native to the shores of Europe, North Africa, and western Asia, it thrives in some of the most inhospitable environments nature provides. Found on shingle beaches, sand dunes, and windswept cliffs, it is adapted to survive where few other species can. Its blue-green, deeply lobed leaves are coated with a waxy layer that helps reduce moisture loss and protect against salt spray, allowing the plant to withstand intense sun, saline winds, and poor, shifting soils.

Flowering from June to September, the yellow horned-poppy produces four-petalled blooms that stand out brightly against its muted foliage. These are followed by the plant’s most unusual feature: long, slender seed pods that resemble horns and can reach up to 30 centimetres in length. When mature, these pods split open forcefully, scattering seeds across the surrounding ground - an effective strategy for colonising mobile shingle and sand.

First formally described in the 18th century, the plant’s Latin name reflects its characteristics: Glaucium refers to its glaucous, or bluish-green, leaves, while flavum simply means yellow. Though less celebrated than the red field poppy, the yellow horned-poppy has appeared in folklore and poetry, often associated with themes of resilience and solitude. In some coastal traditions, picking the plant was considered unlucky and thought to bring storms or bad fortune to sailors.

Despite being toxic in all parts, the plant has a long history of medicinal and practical use. It contains the alkaloid glaucine, responsible for the yellow latex it exudes when cut. This compound, while potentially harmful, has been used as a non-opioid cough suppressant and bronchodilator, particularly in Eastern Europe, where glaucine salts were once prescribed for respiratory conditions. In English folk medicine, the root was sometimes used in poultices to treat bruises and pains. Historically, oil pressed from its seeds served as an ingredient in soap-making and as lamp fuel, although these uses have declined in modern times.

The yellow horned-poppy remains almost entirely coastal in its distribution, rarely found inland except as a garden escape or in areas where ancient shorelines once lay. Its ability to tolerate drought, salt, and wind makes it valuable in stabilising loose beach sediments and supporting fragile coastal ecosystems. The plant’s yellow sap can stain skin and was occasionally used as a dye. Gardeners sometimes cultivate it for its unusual appearance and resilience, particularly in gravel or seaside-themed gardens. It is unpalatable to deer, largely pest-free, and its bright blooms are attractive to bees. However, due to its toxicity, it should be handled with care, especially in gardens frequented by children or pets. Further information is available from The Wildlife Trusts and Wikipedia.

It is worth noting that as part of the council’s Black Rock Rejuvenation Project, the yellow horned-poppy is among 1,000 young plants now settling into specially designed shingle beds at the eastern end of Brighton Beach. These yellow horned-poppies were propagated by horticulturalists at Kew’s renowned Millennium Seed Bank at Wakehurst, using cuttings collected from existing beach populations by the Black Rock Project Team in collaboration with Kew experts. After being carefully nurtured and grown from both cuttings and seed, the yellow horned-poppies have been replanted in innovative ‘wave’ design beds that help shield them from the challenging coastal environment. See also Vegetated shingle.