The project partners from Federal Research and Training Centre for Forests, Natural Hazards and Landscape Austria (BFW) and Croatian Forest Research Institute spent one week, from 26-30/8/2019, in Bad Radkersburg (Austria). The goal of the joint field trip was to find plus trees of the target project species according to the project working plan. The partners chose the plus trees of the following species: Alnus glutinosa Gaertn., Quercus robur L., Fraxinus excelsior L., Ulmus minor Mill. and Populus nigra L. The coordinates of all trees were taken and estimation elements were measured. During the field trip partners visited the BFW’s nursery where the production process and forest reproductive material storage process were presented to them. This successful cooperation between project partners in choosing the plus trees is planned to be implemented in all other partner countries.