Growing 6–7 feet, 'Sémaphore' features slender dark-bronze leaves topped by spikes of narrow-petaled flowers in an unusual glowing color – not quite yellow, not quite orange, like flickering tongues of flame.
Fertile soil, full sun. Water freely in dry weather, deadhead regularly. Where not hardy, lift after autumn frost, store frost-free in barely damp peat/leaf mold. Greenhouse: full light with shade from hot sun, water freely, fertilize during growth. Propagate by chipped/soaked seed at 70°F in spring/autumn, divide in spring. Pests: slugs, snails, spider mites, caterpillars; rust, fungal leaf spot, bacterial blight, viruses.
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