Similar symptoms can have different causes
Shriveling does not prove a plant has a dry root ball. Roots damaged in persistently wet material may also fail to supply the leaves. Check moisture, stem firmness and recent growing conditions before adding another drink.
If the plant is loose or soft at the base, inspect the roots carefully and separate sound material from decay. Avoid strong fertilizer during recovery. Do not strip healthy leaves merely because they look less full than a seller photograph.
FAQ
Should I mist shriveled leaves first?
Not as a substitute for checking roots. Leaf appearance alone does not establish what the plant needs.
Source
RHS: Growing houseplant cacti and succulents
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