In this diploma thesis, the influence of watering of the garden candytuft (Iberis umbellata L.) with solution of heavy metal (copper), as well as the influence of various humus additions to the ability of copper hyperaccumulation in garden candytuft was examined. By visual characterization of the garden candytuft, it was noticed that the garden candytuft, independently in which humus the plant was growing or with what it was watered, did not show any visible signs of phytotoxicity. The highest concentration of copper in the garden candytuft was measured in the samples of the plant that was watered with a solution of heavy metal CuSO4∙5H2O (731.61 μg g-1), while the lowest concentration was measured in the sample of the garden candytuft which was watered with water and grown in humus without additives (7.07 μg g-1). Depending on the type of sorbent added in humus, the copper content in the plant also varied. The highest concentration of copper in the plant organs was detected in the garden candytuft grown in humus with the addition of egg shells (69.78 μg g-1), and the lowest in humus with the addition of zeolite NaX (37.14 μg g-1). Given that the garden candytuft in a forty-day period of watering with an aqueous copper solution has taken up a high concentration of copper in its organs (731.61 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 garden candytuft should be treated longer with aqueous copper solution to prove the hyperaccumulation of copper as a heavy metal in the garden candytuft.