The success of soil bioengineering measures depends on the development of the used plants. For analytical and representative purposes of this dynamic process, repeated digitalizations of these living construction materials were conducted and virtual models have been created. For measuring the test plant, an electromagnetic digitizer had been used. In the course of this thesis, the applied method has been compared with image-based methods and laser scanning, two other common techniques for plant modeling, based on optical components. It turned out that the electromagnetic digitizer possesses its main advantage in not to be af-fected by occlusion of the plant through parts of it, like stems and leaves. Its main disad-vantages lie in the limited operational radius and the sensitivity to electric and metallic mate-rials in the environment. Regarding the possibilities of the digitizer, we succeeded to create a complete geometric copy of the plant, using the computer programs PiafDigit for measuring the three-dimensional coordinates and VisuAlea for visualization purposes. Based on consecutive measurements within the years 2010 and 2011, we also were able to calculate the plant volumes at different points in time and observed a 14% increment of the volume during one vegetation period.