The Žardė–Laistai–Bandužiai archaeological complex is one of the largest and most unique prehistoric sites in western Lithuania, dating from the 1st millennium BC to the 13th–14th centuries. Within the complex, the ancient settlements of Bandužiai (Žardė) and Bandužiai I are distinguished by the abundance of features linked to production and economic activities. Years of research at the Bandužiai (Žardė) settlement have provided copious amounts of archaeological material, mostly related to metallurgical activities, but its fragmentary nature makes interpretation difficult and highlights the need for an interdisciplinary approach. This paper presents a more comprehensive overview of the Bandužiai (Žardė) settlement through archaeobotanical finds which have been systematically collected but only analysed to a limited extent. The material derives from multiple archaeological contexts, some of which were radiocarbon-dated using AMS. The dates revealed a direct chronology for some archaeological features, extending from the Late Bronze Age to the Late Iron Age, with the exception of the Roman period. The archaeobotanical analysis produced a large dataset of charred and waterlogged plant remains, enabling detailed insights into agricultural practices, settlement structure and environmental conditions over time, and providing rare insights into plant use in production-oriented areas. Results demonstrated that while the main cultivated species varied across different phases, environmental conditions remained relatively stable. Wild and cultivated plants indicated a frequent human presence from the Pre-Roman period, intensifying in later times. Evidence also suggests that the site might have been used differently at certain times, with a clearly defined industrial zone, a possible food preparation zone and even a short-lived domestic zone during the Viking period. These findings provide one of the most comprehensive archaeobotanical datasets from western Lithuania, contributing to wider discussions of agricultural development and human–environment interaction in the eastern Baltic.