Knotgrass and knotweed are widespread invasive plants. They are melliferous, flowering in August-September, but few beekeepers take their hives to knotgrass fields, so it is a scarce honey. When the weed flowering period is over, beekeepers move to coniferous forests, so knotgrass honey may also contain honeydew honey.
This honey varietal is intense, with a molasses-like taste and smell, very dark in colour. Sometimes it can crystallize in a few months, sometimes more slowly. It is supposedly the most enzyme-rich Greek honey and is harvested mainly in the North of the country (Kilkis / Polykastro area); or in Northern Peloponnese. In Greece, it is called “polygonum honey”.