A 30-year-old cycad (often called sago palm) showing blackening leaves and a soft stem is likely suffering from root rot, typically caused by excessive moisture. Even established plants can succumb if drainage is compromised or rainfall is unusually high.
Water only when the top several inches of soil are dry. Avoid overhead watering that wets the crown. In rainy climates, consider a rain shelter or moving potted specimens under cover during prolonged wet spells.
For detailed cycad care and troubleshooting, visit Jungle Music's Cycad Advice.
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