A potted azalea left unwatered for three months with only a damp cloth at its base has suffered severe desiccation. The fact that soil now repels water (hydrophobic condition) and roots remain firm suggests the plant may still have living tissue, but recovery is uncertain.
Attempt this emergency protocol: repot into a significantly larger container with fresh, acidic potting mix amended with peat moss. Severely prune all dead growth—cut back to green tissue, even if that means reducing the plant to a few inches. Soak the entire root ball in a bucket of water until air bubbles stop rising, ensuring thorough rehydration. Apply a dilute, acid-forming fertilizer with micronutrients.
Place in bright shade (no direct sun) and maintain consistent moisture—never let it dry out again. Mist foliage daily to increase humidity. New growth may emerge in 4-8 weeks if the cambium layer survived. If no signs appear by midsummer, the plant is beyond saving. Consider this a hard lesson: azaleas in containers need reliable irrigation systems or caretakers during absences.
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