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Overview
Papaver cambricum, commonly called Welsh poppy, is a short-lived perennial or biennial in the family Papaveraceae, native to damp, shaded rocky slopes, woodland margins, stream banks, and wall crevices in the mountains and uplands of western Europe — Wales, England, Ireland, France, Spain, Portugal, and the Pyrenees. Formerly classified for many decades as Meconopsis cambrica, it was reclassified back to Papaver on the basis of molecular phylogenetic evidence in 2011. Plants form clumps of deeply pinnately divided, slightly hairy, bright green leaves 6–10 inches (15–25 cm) tall, from which slender, wiry stems rise 12–18 inches (30–45 cm) bearing solitary, four-petaled flowers in butter-yellow to rich golden-orange, each 1.5–2 inches (4–5 cm) across with a central boss of yellow stamens. The tissue-paper-thin petals have the characteristic silky, crinkled texture of poppy flowers. The species blooms from late spring through summer and self-seeds prolifically — sometimes excessively — naturalizing freely in Pacific Northwest gardens in cracks, borders, and shaded areas. A double-flowered form ('Flore Pleno') is available in both yellow and orange. All parts contain milky latex and are mildly toxic.
Native Range
Native to the mountains and uplands of western Europe, with the core range in Wales, Ireland, western England, and northwestern Spain and Portugal (the Pyrenees and Cantabrian Mountains), growing in damp, shaded rocky slopes, woodland margins, stream banks, and old wall crevices. Also naturalized in Belgium, the Netherlands, and Scandinavia. Not native to North America but widely naturalized in Pacific Northwest gardens by self-seeding.Suggested Uses
Welsh poppy is a charming, long-flowering, easy-care perennial for Pacific Northwest shade and semi-shade gardens, naturalizing freely in the cottage garden, woodland edge, shaded border, and wall crevices. The butter-yellow to golden-orange flowers from late spring through summer provide bright color in positions where most perennials bloom only briefly. Allow it to naturalize in informal areas; control by removing seed capsules in more formal plantings. Combines well with Geranium, Alchemilla, Pulmonaria, and early ferns in a naturalistic shade border. The double-flowered form 'Flore Pleno' is longer-lasting and lower-seeding than the singles. A reliable, low-maintenance plant once a colony is established.How to Identify
Appearance
Size & Dimensions
Height1' - 1'6"
Width/Spread1' - 1'6"
Reaches mature size in approximately 2 years
Bloom Information
Welsh poppy blooms from late spring through summer and often into early autumn, typically May through September in Pacific Northwest gardens, with peak flowering in May and June. Individual flowers last only two to three days but are replaced continuously over the long season. The prolific self-seeding means that in an established colony, plants of various ages are present simultaneously, extending the overall blooming display. Removing seed capsules before they ripen can moderate self-seeding while prolonging flowering.Detailed Descriptions
Flower Description
Butter-yellow to golden-orange; solitary, four-petaled, tissue-paper-thin silky petals; on slender wiry stemsFoliage Description
Deeply pinnately divided, bright green, slightly hairy; forms low basal clumpGrowing Conditions
Sun Requirements
Tolerates up to 8 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Plant in partial shade to full sun in any reasonably fertile, moist to well-drained soil. Welsh poppy is remarkably adaptable — it tolerates dry shade, poor soils, and cracks in walls and paving where it self-seeds readily. In Pacific Northwest gardens it naturalizes prolifically by self-seeding; allow seedlings to establish where desired and remove unwanted plants while still small, before the taproot develops. The plant is short-lived (typically 2–4 years per individual) but maintains itself perpetually through self-seeding in suitable gardens. Does not transplant well due to a taproot — sow or plant into final position. Water during establishment; established plants tolerate modest drought.Pruning
Deadhead spent flowers promptly by removing the developing seed capsule to prolong flowering and reduce self-seeding, though in an established colony some seed set is desirable to maintain the population. Remove whole plants after they finish flowering and set seed in their second or third year. The colony perpetuates itself from self-sown seedlings; thin to desired density in spring.Pruning Schedule
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