Not enough light
Leaves that stay shut during the day and stems stretching toward the glass mean it's under-lit.
Diagnosis
Not enough light
What's happening
Oxalis triangularis folds its triangular leaflets down at night and reopens them by day — but it only opens fully in good light. In dim conditions the leaves stay half-closed, the deep purple washes out toward pale or greenish, and the thin stems stretch and flop as they reach for a brighter source, leaving the plant leggy and sparse.
How to fix it
Move the plant to a brighter spot with plenty of bright, indirect light — right beside an east or north window, or filtered south/west light. If your space is genuinely dim, a full-spectrum grow light makes a real difference and is often the only way to restore the rich color and tight, upright habit. Trim the leggiest stems back to the soil so fresh, compact growth fills in.
What fixes it
- A full-spectrum LED grow light — A full-spectrum grow light restores the light a Purple Shamrock needs to open fully, color up, and stop stretching.
If that doesn't fix it
This is general guidance based on common symptoms; individual plants vary.
Read the full Purple Shamrock care guide →
Reviewed June 2026 · how we check this