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Characteristics Flowering Shrubs and Trees Indigofera. Height of plant (cm) 150-200 cm. Flower size middle. Shelter in winter shelter is not required. Fragrant flower no fragrance. Growth rate medium growing. Landscape use group planting, specimen, hedge. Flower colour pink. Timing of flowering autumn, august, july. Cold hardiness zone 4 (-34 to -29°c), 5 (-29 to -23°c), 6 (-23 to -18°c), 7 (-18 to -12°c), 8 (-12 to -7°c), 9 (-7 to -1°c). Water needs moderate. Light needs full sun. Not poisonous plant. Neutral soil. Frost resistance. Sandy loam soil, loamy soil.