Oxalis drooping

On common false shamrock, Oxalis triangularis, leaflets fold with changes in light. If they open again during the day and stalks stay firm, no watering correction is needed.

Persistent daytime collapse

Check the root ball. Water a dry actively growing plant evenly and drain. If it stays wet, check for soft underground storage tissue or rotten roots.

A gradual whole-plant fade with no new shoots can mark dormancy, but wet-soft tissue is rot. Reduce watering as growth stops. The leaf-drop guide explains what to retain through a rest period.