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Alcea rosea 'Radiant Rose' belongs to the Spotlight Series, noted for its truly perennial cultivars, not biennial. Grows vigorously up to 5-6 ft. high (150-180 cm) and 2 ft. wide (60 cm). Hollyhocks easily self-seed and can establish colonies in the garden. Performs best in full sun, in average, medium moisture, well-drained soils.