Yes, cinnamon is known for its antifungal properties, and it can help stop root rot when used as a natural remedy. Its natural compounds can inhibit fungal growth and prevent the spread of root rot. You can sprinkle cinnamon powder on the affected roots or mix it with water to form a paste before applying it to the roots. However, cinnamon should be used as a supplementary treatment, and it is always best to combine it with proper care, like improving drainage and avoiding overwatering, for the most effective results.