Finnish Knotweed
Koenigia × fennica is a hybrid of Koenigia alpina and Koenigia weyrichii. The cultivar “Johanniswolke” shown in this article can grow up to 1.5 meters high and flowers from June to September (in Central Europe).
Popular name(s): Finnish Knotweed
Botanical name: Koenigia × fennica “Johanniswolke” (syn.: Aconogonon × fennicum, Polygonum polymorphum)
Family: Polygonaceae
Origin: Koenigia alpina: Asia, Europe (distribution map), Koenigia weyrichii: Asia (Japan, Russia) (distribution map)
Height: 100 to 150 centimeters
USDA zone: 5 (-9.4 °F/-23 °C)
Poisonous: No
Categories: Garden plants | White flowers |
