String of pearls leaves falling off: causes and what to do
9 results in the diagnosis tree begin with leaf drop, 3 of them marked likely when the answers fit. They are ordered here for String of pearls (Curio rowleyanus), using what its sources say about cold tolerance, light, soil moisture and watering and one problem recorded for it.
Sources last read 14 September 2026.
Curio rowleyanus, syn. Senecio rowleyanus, is a flowering plant in the daisy family Asteraceae. Wikipedia, CC BY-SA 4.0
Native range: Cape Prov. (subtropical). Also sold as Bead Plant, Irish Beads, Necklace Plant, Rosary Vine, String of Beads and String of Marbles.
What String of pearls’s sources say that bears on this
- Cold tolerance
- H2 — 1–5°CRHS · read 13 September 2026
- Light
- Full sun, Partial shadeRHS · read 13 September 2026
- Soil moisture
- Well-drainedRHS · read 13 September 2026
- Watering
- It copes with infrequent watering, but too much water can cause root rot. The rounded leaves expose less surface to dry desert air, so they lose less water or moisture.NC State Extension · read 13 September 2026Over winter, give little water and hold the temperature between 13°C and 16°C (55-60°F).RHS · read 13 September 2026
How this shows up on a String of pearls
Swollen, darkening leaves that come away at a touch
Soft, discoloured tissue appears where the leaves join the stem of the string of pearls, and the compost smells stale rather than earthy.
A plant that stores its own water has little use for more. Kept in well-drained soil that stays wet, the stored tissue takes up water it cannot release and the cell walls give way.
Telling it apart: Press one gently. A dehydrated leaf is leathery and springs back; a waterlogged one stays dented.
RHS · read 13 September 2026Possible causes, likeliest first for a String of pearls
Most likely too much water
Ranked higher because String of pearls's recorded problems point this way.
String of pearls stores water in its own tissue, which makes it more sensitive to wet soil than most leafy plants, so this reading is stronger for it.
Why: Soil that is wet two inches down, under leaves that are yellowing from the bottom or falling, points at roots that cannot breathe.
What to try:
- Hold off watering until the top two inches of soil are dry, and check again with a finger rather than by the calendar.Useful: moisture meter
- Empty any water standing in the saucer or the outer pot within half an hour of watering.Useful: pot with drainage holes
What would settle it: Lift the string of pearls out of its pot. Healthy roots are firm and pale; roots that have been wet too long are brown, soft and smell sour.
Probably too much water, but this is not settled
Ranked higher because String of pearls's recorded problems point this way.
String of pearls stores water in its own tissue, which makes it more sensitive to wet soil than most leafy plants, so this reading is stronger for it.
Why: Wet soil and yellowing lower leaves usually mean the roots have been wet too long.
What to try:
- Let the soil dry to two inches down before the next watering.Useful: moisture meter
- Tip the string of pearls out and look at the roots before deciding whether to repot.Useful: well-draining potting mix
What would settle it: Two observations separate them. How long the soil stays wet after a full watering: more than about a week in a room at normal temperature suggests the pot rather than the schedule. And the roots themselves: firm and pale, or brown and soft.
Most likely a reaction to the change
Why: Many plants drop healthy leaves when their light, temperature or draughts change suddenly.
What to try:
- Leave it where it is now rather than moving it again, unless the new spot is plainly too dark or too cold.Useful: min-max thermometer
- Keep it away from radiators, air vents and doors that open to the outside.Useful: min-max thermometer
What would settle it: Whether the dropping slows within a few weeks of the string of pearls staying put. A string of pearls adjusting settles; one with a separate problem keeps losing leaves.
Less likely for a String of pearls, still possible
Questions
- What usually causes leaf drop on a String of pearls?
- For String of pearls: most likely too much water, probably too much water, but this is not settled and most likely a reaction to the change. String of pearls stores water in its own tissue, which makes it more sensitive to wet soil than most leafy plants, so this reading is stronger for it.
- How can I tell which one it is on my String of pearls?
- Which leaves are falling, and what do they look like? Green leaves, several at once; Yellow leaves, the oldest first; Dry, brown leaves; A tree or shrub that loses its leaves each autumn, and it is autumn.
- What do String of pearls's sources say about its cold tolerance?
- RHS: H2 — 1–5°C.
- What does this look like on a String of pearls?
- Soft, discoloured tissue appears where the leaves join the stem of the string of pearls, and the compost smells stale rather than earthy. Telling it apart: Press one gently. A dehydrated leaf is leathery and springs back; a waterlogged one stays dented.
- Is String of pearls safe to handle while I check it?
- Its sources list it as toxic to people. Wash your hands after handling the roots or sap, and keep trimmings away from pets.
Other plants that show leaf drop
Aloe veraWashed-out patches that do not spread to the shaded side
Baby's tearsWhitened areas where the sun falls longest
Bunny ears cactusWhitened areas where the sun falls longest
Burro's tailSwollen, darkening leaves that come away at a touch
Crown of thornsSwollen, darkening leaves that come away at a touch
Jade plantSwollen, darkening leaves that come away at a touch
Something else wrong with the String of pearls?
What this does not cover
This page orders a decision tree's results using a plant's sourced care. It has not seen your plant, its pot or its window, and two problems at once are common: that is the usual reason a confident answer turns out wrong. The questions in the diagnosis tool narrow it further than a list can.