In this diploma thesis, the influence of rocket (Eruca vesicaria (L.) Cav.) watering with heavy metal (copper) solution, as well as the influence of various humus additives to the ability of copper hyperaccumulation in the rocket was examined. It was noticed that the rocket, independently of in which humus the plant was growing or with what it was watered, did not show any visible signs of phytotoxicity. On the contrary, the rocket watered with the aqueous solution of CuSO4∙5H2O had darker leaves during the whole period of treatment and had the smallest amount of dry leaves after forty days of cultivation. The highest concentration of copper in the rocket was measured in the samples of the plant that was watered with a solution of heavy metal CuSO4∙5H2O (624.32 μg g-1), while the lowest concentration was measured in the sample of the rocket which was watered with water and grown in humus with the addition of humus on which the copper was previously sorbed (70.86 µg g-1). Given that the rocket in a forty-day period of watering with an aqueous copper solution has taken up a high concentration of copper in its organs (624.32 μg g-1) with no visible signs of phytotoxicity it can be concluded that it is a hypertolerant plant for copper as a heavy metal. In further investigations the rocket should be treated longer with aqueous copper solution to prove the hyperaccumulation of copper as a heavy metal in the rocket, as well as to investigate its influence on the growing and development of the rocket.