Encyclopedia - Plants for ponds
Sakhalin knotweed
Polygonum sachalinense
Family: Buckwheat family. Grows wild in southern Sakhalin, the Kuril Islands, and Japan.
Perennial herbaceous plant with a creeping rhizome. Stems erect, hollow, sturdy, up to 300 cm tall, green or brown. Leaves large, up to 30 cm long and 20 cm wide, broadly ovate or ovate-elongate, on short petioles. Flowers small, whitish-cream, arranged in a paniculate inflorescence up to 20 cm long. Blooms in July-August for 40-45 days. Fruit - three-angled, dark brown nutlet. Winter-hardy. Used as an ornamental foliage plant to screen outbuildings and create thickets. In cultivation since 1863.
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