Different rules apply to the planting of perennials in cities are used compared to them using at garden beds at home. Much more different conditions in cities enhance the importance of using more appropriate substrate in these regions. Planting of four different perennials in center of Ljubljana, each in its own bed, served as a starting point for this thesis. We planted Dwarf fountain grass (Pennisetum alopecuroides), Grand stonecrop (Sedum maximum 'Herbstfreude'), Spiraea (Spiraea bumalda 'Goldflame'), and Japanese sedge (Carex morrowii 'Variegata'). Two different substrates, VulkaHum and KompoHum, containing 14 % biochar, both from the same manufacturer – Humko, were used in the trial. The aim of the thesis was to determine how the substrate KompoHum affects the growth of perennials, as it contains a high percentage of biochar, which is supposed to possess numerous positive effects not only on the growth of plants, but also on the improvement of the soil. Final results tend to favourable growing conditions, as none of the plants experienced a delay in development. Dwarf fountain grass flowered worst in first garden (VulkaHum), and Japanese sedge was similar in growth in all garden beds. Grand stonecrop flowered best in the third garden (KompoHum), but this may be due to the poor quality of plants at the fourth garden (VulkaHum) at the beginning of the experiment. Both substrates did their job in the field, so they are good for planting in cities.
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