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Easily grown in average, medium moisture, well-drained soils in full sun to part shade. Best flowering occurs in full sun. Prefers moist, organically rich soils, but tolerates poor soils and some drought. Very tolerant of summer heat and humidity. Generally tolerant of urban conditions. Prune to shape in spring. Pruning back to 2-3 buds in late winter may produce larger blooms. Easily propagated by stem cuttings. This is a sterile cultivar that does not produce seed.
Rose of Sharon (shrub althea) is a vigorous, upright, vase-shaped, multi-stemmed, deciduous shrub that typically grows 8-12′ tall. It may be trained as a small tree or espalier. Showy, hollyhock-like, 5-petaled flowers (to 3″ diameter) appear over a long, early-summer to fall bloom period. Each flower has a prominent and showy center staminal column. Palmately-veined, coarsely-toothed, three-lobed, medium green leaves (to 4″ long). No fall color. ‘Helene’ is a triploid cultivar developed by the National Arboretum in the 1970s and released to commerce in 1980. It is more compact than the species, typically maturing to 6-8′ tall. It features ruffled, thick-petaled, white single flowers (to 4″ diameter) with a dark red eye. Zones 5 to 8.