Japanese knotweed (Fallopia japonica) is a fast-growing non-native species that is placed on the list of 100 most dangerous invasive species in the world. Expansion and overgrowth trends are worrying and in some areas even alarming. A really effective way of limiting and exterminating of this highly invasive plant has not yet been discovered, especially due to the fact that the plant is widespread and thrives in larger stands.
The purpose of the final seminar paper was to study the spread and change in the density of the knotweed over a period of two years. The aim of the final seminar paper was to select four study stands of smaller size. Measurements were made between March and August, at a monthly measurement interval. Several density measurements were performed at each stand, which were later extrapolated to the entire stand and we calculated average growth values per month and between 2017 and 2018. The results were surprising as knotweeds were expanding negligibly in all areas but rapidly increasing in density from month to month. In some areas, even a decline in the number of plants within the entire stand was recorded.