Hello. Considering the current condition of the plant, it is recommended to remove the affected roots (dry/rotten, etc.) and repot it in a larger pot (Indoor plants - Repotting) using a new potting mix: . Immediately after repotting, it is recommended to use a natural fertilizer that helps to improve the quality of the substrate, supports root development, and increases the plant’s resistance to stress factors, such as . Can be administered by watering, in a dose of 50 ml/10 liters of water. It is recommended to apply 3-4 treatments at 10-14 day intervals. In addition, from spring onwards, as well as during the growing season, to ensure proper nutrition, you can consider regular application of a fertilizer specially formulated for the nutritional requirements of houseplants, such as , applied according to label recommendations. For more information and tips on caring for these species, you can follow our article: Strelitzia, plant care and growing guide.