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Characteristics Garden Flowers Ialian Aster. Height of plant (cm) 30-70 cm. Fragrant flower no fragrance. Type of stem erect. Flower size small. Shelter in winter requires shelter. Cold hardiness zone 5 (-29 to -23°C), 6 (-23 to -18°C), 7 (-18 to -12°C), 8 (-12 to -7°C). Method of cultivation seedling. Flower color lilac, pink, light blue, white. Landscape use flowerbed, border, rock garden. Light needs full sun. Timing of flowering autumn, august, july, june. Water needs low. Not poisonous plant. Lifetime annual, perennial. Sandy soil. Frost resistance. Neutral soil.