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Characteristics Flowering Shrubs and Trees Indigobush, False Indigo, Bastard Indigo, River Locust. Height of plant (cm) 150-200 cm. Flower size small. Fragrant flower fragrance. Shelter in winter shelter is not required. Growth rate fast growing. Flower colour lilac, purple. Landscape use specimen, hedge. Cold hardiness zone 2 (-45 to -40°c), 3 (-40 to -34°c), 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). Timing of flowering july. Light needs full sun. Water needs moderate. Not poisonous plant. Frost resistance. Neutral soil. Sandy loam soil.