Kalanchoe leaves soft and wilted? Two tricks to get strong roots, green leaves and lots of flowers

The kalanchoe leaves have gone soft, with red edges, and there are black spots on the leaves - is there any way to fix this? From the picture, this plant of yours either has a root problem, or you haven't watered it for a long time. Those are the only two reasons.
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Because its leaves have clearly gone soft, and red edges have appeared all around them. In this case, the main cause is severe lack of water; too much light is what caused the red edges to appear, and the soft leaves prove that there aren't enough nutrients being transported to the leaves to keep it perky - either the roots have a problem, or it hasn't been watered for a long time.
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If you haven't gone a long time without watering, I suggest you just repot it with fresh potting soil. The roots are definitely rotting. Once you find this, prune the roots promptly and replant in fresh potting soil. The new soil must be loose and airy. Before planting, soak the roots in mancozeb. Then just let it grow new roots.
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Although kalanchoe is easy to grow, it often runs into all sorts of problems. Its main requirement is that the soil mix must be loose and airy, and it can take light. But it must not lack water - if it goes without water for a long time, its roots will be damaged, and once the roots are damaged, their ability to absorb will decline, which either stops it from growing or makes the leaves wilt. Also, be sure to maintain good ventilation - ventilation is the key to growing any plant well, and the prerequisite for any plant not to have root rot. Deal with it as I've described, and once the roots grow well, it will bloom in winter.
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