Natural leaf aging
An occasional yellow lower leaf on an otherwise lush Purple Shamrock is completely normal.
Diagnosis
Natural leaf aging
What's happening
Oxalis triangularis constantly pushes up fresh stems from its bulbs and lets the oldest ones fade. If only a few of the lowest, oldest leaves are yellowing while the rest of the plant looks full and richly colored, nothing is wrong.
How to fix it
Snip the spent stems off at the soil line if you like the tidier look, and carry on with your normal care. Just keep an eye out that the yellowing stays limited to the oldest leaves and doesn't start spreading through the whole clump.
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