ABSTRACT
In many European countries phytosociology is the most important method of current geobotany. Central European winter crop-weed communities are composed of plants from different natural habitats and areas which arrived in Central Europe at different times. Agrostemma githago seemingly came from the Eastern European steppe area and slowly invaded some parts of Central Europe during the Neolithic and Bronze Age. Furthermore it appears that these weeds did not have the same importance in each region of Central Europe during the Neolithic. Orlaya grandiflora has its natural habitat in Mediterranean grasslands and was brought to Central Europe by the Romans. Neslia paniculata, a continental Asian weed species, was introduced to Central Europe by the Slavs and grew during the Middle Ages only within the territory influenced by Slavic peoples and their trade; nor did it expand very far west in the centuries thereafter.
