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Characteristics Garden Flowers Buckwheat. Height of plant (cm) 5-30 cm. Type of stem erect. Fragrant flower no fragrance. Flower size small. Shelter in winter requires shelter. Landscape use container, flowerbed, border, rock garden. Flower color pink, yellow, orange, white. Method of cultivation non seedlings. Cold hardiness zone 7 (-18 to -12°C), 8 (-12 to -7°C), 9 (-7 to -1°C), 10 (-1 to +4°C). Timing of flowering july, june. Light needs semi-shade, full sun. Water needs moderate. Lifetime perennial. Not poisonous plant. Sandy loam soil, sandy soil. Alkaline soil, neutral soil. Frost resistance.