The article deals with the problem of the invasive species spread (Heracleum sosnowskyi and Heracleum mantegazzianum) which can constitute a significant threat to natural ecosystems, people and economy. The peculiarities of Heracleum distribution on the territory of Kremenets are revealed. As a result of the examination, 20 large colonies as well as about 35 single areas of Heracleum sosnowskyi and Heracleum mantegazzianum were found. The largest and the oldest habitats of Heracleum sosnowskyi and Heracleum mantegazzianum spreading were revealed on the territory of the WOG and AVIAS petrol stations and in the districts of the detour road. The total area occupied by the Heracleum in Kremenets constitutes 804 m 2 . The tendency to territory increase can be observed by 17.2% since 2010. Field studies describe 6 model places that represent the most widely distributed areas of Heracleum sosnowskyi and Heracleum mantegazzianum. Based on the analysis of the obtained results, the main habitats of distribution of invasive species were identified and mapping of their locations was performed. The main threats of uncontrolled spreading of dangerous plants were formulated. The most effective and safe methods of weed control were offered.