Quick answer
Yellow leaves on your string of hearts 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. Water according to moisture, only when the soil has dried out completely. Check drainage and do not add water just because a tip is brown or a calendar says it is time. Remove rotten roots and repot in free-draining mix. If the base is rotten, healthy stem cuttings with nodes can be rooted warm in lightly moist cactus compost. Keep the rooting mix moist, not wet. Established plants need the mix to dry fully between waterings.
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 string of hearts.
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 flat 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 string of hearts), then settle into feeling the soil before every watering rather than watering on a fixed day.
How to tell
String of hearts 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 60 days while it’s actively growing. Overfeeding a slow grower like this does more harm than skipping it.
How to tell
A few of the oldest leaves near the top of the pot shrivel or yellow while the strand tips keep growing plump new ones. That’s normal turnover on a string of hearts, not a symptom.
The fix
Nothing is wrong. Pick off the spent leaves and carry on.
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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