Characteristics Garden Flowers Blue dogbane. Shelter in winter shelter is not required. Flower size middle. Fragrant flower no fragrance. Cold hardiness zone 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), 9 (-7 to -1°C), 10 (-1 to +4°C). Height of plant (cm) 30-70 cm. Method of cultivation non seedlings. Flower color light blue. Landscape use flowerbed, specimen. Type of stem erect. Timing of flowering june. Not poisonous plant. Water needs moderate. Lifetime perennial. Light needs semi-shade, full sun. Frost resistance. Neutral soil. Sandy loam soil, loamy soil, sandy soil.
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