This arčcicle present analysis of a teat number of palaeobotanic samples from 13 historic plots, archaeologiccally excavated 1983 - 1992 in the town of Brno. On this outstandingly large archaeobtanic material changes of the pectrum of plant remains were reviewed for the high medieval ages (and Postmedieval period). For the first time in the Czech Republic this large number of sampled featrues (mainly cesspits) enabled to conclusively monitor the vaying importance of certain utility plant species during a long time span. Also changes in accompaying weed vegetation, icnicating the origins and agrotechniques of cultivated plants were observed. Spectrum of the local synanthrope vegetation fefelct improving hygienic situation within the inbuilt area of Brno town. Timbre/charcoal analysis consclusively refelcts variable sources of wood/ charcoal for the medieval (Postmedieval) town., Petr Kočár, Romana Kočárová, Emanuel Opravil, Rudolf Procházka., and Obsahuje seznam literatury