Quick answer
Yellow leaves on your flaming Katy have a few possible causes, and on this plant the likeliest is overwatering and rot at the base. Check the causes below to find which one fits, then follow its fix.
Overwatering & rot at the base. Stop watering completely. Wait until the soil has dried out completely before you even think about the next one, and check the pot actually drains. If only some roots are brown and mushy, trim them and repot in fresh, fast-draining mix. If the base itself is soft, the damage is more serious and recovery is uncertain. Only propagate using a method suited to this plant, not arbitrary pieces above the rot.
Not a match? Compare the signs below to find the one you have.
How to tell
The yellowing comes with pale, stretched new growth leaning toward the nearest window. That combination shows that the spot is too dim for a flaming Katy.
The fix
Move it to a brighter spot, but keep it out of harsh midday sun, which scorches.
How to tell
The soil is bone dry, and the yellowing arrives alongside wrinkled leaves rather than soft, mushy growth.
The fix
If the soil is dry, water thoroughly (every 8 to 12 days in summer is the usual pace for a flaming Katy), then settle into feeling the soil before every watering rather than watering on a fixed day.
How to tell
Flaming Katy grows slowly and needs very little feeding, so a uniform pale-yellow fade after many months without any is possible, but check watering and light first: those are far more common on this plant.
The fix
Use a cactus and succulent fertilizer at half the strength on the label, about every 30 days while it’s actively growing. Overfeeding a slow grower like this does more harm than skipping it.
How to tell
An older, lower leaf slowly yellows or shrivels on its own while new growth looks plump and healthy. That’s normal turnover on a flaming Katy, not a symptom.
The fix
Nothing is wrong. Remove the spent leaf once it comes away easily and carry on.
How to tell
Silvery patches with tiny black dots point to thrips.
The fix
Rinse the plant, cut off the worst leaves and treat in rounds, as the thrips guide explains.
Water only once the soil has dried out completely, never let it sit in a saucer of water, and give it bright light with a little gentle direct sun, such as morning sun. Root rot, not thirst, is the real risk on this plant.
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