In 2019 we did an experiment on pelargoniums. Pelargoniums are one of the oldest plants for balconies and window shelves in Slovenia, and are very popular because of their rich flowers and continuous blooming from early spring to late autumn. They thrive on sunny, semi-sunny and shady places. In our experiment we focused on how much brightness of a permanent place affects the growth and development of the pelargoniums, including blooming. We also studied how the fertilization of the soil on a permanent place affects the growth and blooming of the plants. We monitored plants’ height, shoots’ length, number of shoots, lenght of the plants’ stems, number of plants’ stems, soil’s salinity, soil’s temperature and soil’s moisture. During the experiment we also measured the sunlight. After we finished the experiment, we measured the soil pH, and plants’ fresh and dry mass in the laboratory. Plants on the semi-sunny side thrived best. Their average height and number of flowers were bigger than of the ones on the sunny side. Plants looked lusher in the appearance. The direct sunlight on the sunny side damaged leaves and flowers of the plants so the results weren’t the best. The results of fertilization of plants showed the best results in balcony troughs fertilized according to recommendations. If we combine results in terms of growth, plants grew the worst on the sunny side in over-fertilized troughs. However, plants in the unfertilized troughs had a lower leaf density and the color of leaves was inferior. Visual evaluation analysis showed that plants on the sunny balcony in the unfertilized troughs had the worst growth.
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