Japanese knotweed
Reynoutria japonica
- Flowering period
- August–October
- Nectar
- sehr gut
- Pollen
- mittel
Japanese knotweed flowers from August to October with creamy white flower panicles. It comes from East Asia, grows on riverbanks and railway embankments in impenetrable stands, and is considered one of the most problematic introduced plants of all. For the colony it is a very productive late forage source, often the last of the year. British measurements give around 57 micrograms of sugar per flower per day, around 8,436 pollen grains per flower and a nectar yield of around 160 kilograms of sugar per hectare per year.
Sources (6)
- Reynoutria japonica, Wikipedia
- Reynoutria japonica, Euro+Med PlantBase über PESI
- Reynoutria japonica, GBIF Backbone Taxonomy
- Filipiak, Walczyńska, Denisow, Petanidou, Ziółkowska (2022): Phenology and production of pollen, nectar and sugar in 1612 plant species from various environments
- Baude, Kunin, Memmott (2015): Nectar sugar values of common British plant species [AgriLand]
- Baude, Kunin, Davies, Wright, Memmott (2025): Pollen production values of common British plant species