Lychnis flos-cuculi (ragged robin (Synonym Silene)) is a member of the Caryophyllaceae family. This perennial exhibits a clump forming growth habit and is characterised by its deciduous foliage. It has a hardiness rating of very hardy (colder than -20ºc) and is hardy in the severest European continental climates, including exposed upland locations in the UK.
When fully mature, Lychnis flos-cuculi can reach an ultimate height of 0.5–1 m and a spread of 0.1–0.5 m. For optimal growth, it prefers an east–facing, south–facing, or west–facing aspect and an exposed or sheltered position. It thrives best in clay, loam, or sand soil types and should be placed in full sun or partial shade.
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