What do I do for my daisies that are wilting and not blooming and the bottom of the stem is black?

Wilting daisies with blackened stems may be suffering from root rot or a fungal infection. First, check the soil for overwatering; allow it to dry out before watering again. Trim away any affected stems and leaves, and consider repotting the plant in fresh, well-draining soil. If the problem persists, applying a fungicide may help, but ensure proper care practices to prevent recurrence.