Studies on the effect of growth hormones in the propagation of globularia orientalis L. and globularia trichosantha fisch. & mey. subsp. trichosantha natural taxa with cutting and its use in landscape design

In this study, G. orientalis and G. trichosantha taxa were produced with cuttings in a controlled greenhouse, the effects of rooting hormones were determined and the results were compared. In addition, usage areas were determined in landscape works. Before the flowering period in April, green top cuttings were taken. Rooting rate (%) and root quality (number of roots, longest and average root length) of the cuttings removed after rooting were determined and recorded. Control group, IBA and NAA concentrations of 2,000 ppm, 4,000 ppm, and 6,000 ppm were used in G. orientalis cuttings. According to the data obtained after rooting, a statistically (p<0.05) significant difference was obtained between the applications. The best rooting was seen at the rate of 67% in the application of 2,000 ppm of IBA hormone, while the least rooting was observed in the application of 6,000 ppm of NAA at the rate of 13%. Control group, IBA concentrations of 2,000 ppm, 4,000 ppm, and 6,000 ppm were used in G. trichosantha cuttings. According to the data obtained after rooting, a statistically significant difference was obtained between the applications. In G. trichosantha cuttings, the best rooting was observed at the rate of 90% in 0 ppm hormone application, while the least rooting was observed in the application of 6,000 ppm hormone at the rate of 37%. The aesthetic, functional, and ecological traits of G. orientalis and G. trichosantha taxa demonstrate their broad applicability in landscape architecture. While G. orientalis is considered unsuitable for use in vertical gardens due to its deep taproot system, it has been identified as effective for erosion control, ground cover, and border planting in arid and calcareous soils. Conversely, G. trichosantha, possessing a fibrous root system, is deemed suitable for vertical gardens as well as for moist environments and areas adjacent to water features.