String of pearls is sold as Senecio rowleyanus on almost every plant label — but that name was officially reclassified. The correct current name is Curio rowleyanus, following the reclassification of the former Senecio group under APG IV. This is more than a trivia point: it explains why you may find conflicting care advice online written under different names, and it signals that this plant belongs to a different evolutionary branch than many of the “senecio” plants it’s grouped with in garden centers.
| String of Pearls Quick Care Summary | |
|---|---|
| Light | Bright light with 3–4 hours of direct sun daily |
| Water | Every 14–21 days; let soil dry completely between waterings |
| Humidity | 40–50%; tolerates dry air |
| Temperature | 60–80°F (15–27°C) |
| Fertilizer | Monthly spring–summer, diluted balanced fertilizer |
The plant itself is a South African succulent with spherical leaves on trailing stems that can reach 2-3 feet long. It grows natively in the arid, rocky landscapes of South Africa’s Little Karoo and Eastern Cape, where it trails along the ground or spills over rock faces in semi-arid conditions. Getting the care right means understanding where it actually comes from — not where the label says it belongs.
Why Is My String of Pearls Shriveling?
This is the most common question, and the answer depends on how the beads are shriveling:
- Wrinkled, deflated beads with dry soil: Underwatering. The beads lose water stored inside them. Water thoroughly and they plump back up within 24-48 hours.
- Mushy, soft, translucent beads: Overwatering or root rot. The cells burst from excess moisture. Remove the plant from its pot, trim rotted roots, and repot in dry mix. Do not water for 1-2 weeks.
- Shriveling only at stem tips: Usually root rot — even though the beads near the base look fine, the roots can no longer move water upward.
The two causes produce completely opposite treatments. Diagnosing which one you have before acting is critical. A soil moisture meter or simply sticking your finger 2 inches into the soil will tell you immediately.
What Is the Correct Name — Senecio or Curio Rowleyanus?
Both appear in plant databases and garden centers, but the current accepted scientific name is Curio rowleyanus. The reclassification moved string of pearls and several related plants out of the genus Senecio and into the genus Curio based on molecular phylogenetic data — they are more closely related to each other than to the broader Senecio group.
For practical purposes, the two names refer to the same plant. When searching for care information, you may need to search both names to find everything that’s been written about it. Articles written before approximately 2020 almost universally use the old name.
String of Pearls vs. String of Bananas: What’s the Difference?
String of bananas (Curio radicans, formerly Senecio radicans) is closely related — same genus, similar trailing habit — but the bead shape is different. String of pearls has round, spherical beads. String of bananas has elongated, crescent-shaped beads that resemble tiny bananas.
Care is similar but string of bananas is slightly more drought-tolerant and faster-growing, making it somewhat easier for beginners. Both have the same toxicity profile and the same basic light/water requirements. String of bananas is also more forgiving of occasional overwatering than string of pearls.
How to Care for String of Pearls
How Much Light Does String of Pearls Need?
Bright light with several hours of direct sun — ideally 4-6 hours of direct morning sun (east-facing) or bright indirect light from a south or west window. String of pearls is a succulent from a semi-arid environment; it needs more light than most houseplants.
Insufficient light is the second most common cause of failure (after overwatering). Without adequate light, stems grow long and leggy with widely spaced beads, and the plant loses its dense, lush cascade. In low light, it simply declines slowly.
How Often Should You Water String of Pearls?
Water thoroughly, then allow the soil to dry completely before watering again — typically every 2-3 weeks in the growing season (spring and autumn), and once per month or less in winter and summer. String of pearls is drought-adapted; its beads store water reserves.
The “when to water” test: squeeze a bead gently. If it feels firm and plump, wait. If it feels slightly soft or the beads look like they’ve lost some roundness, water now. This is more reliable than any fixed schedule, which changes with season, pot size, and humidity.
What Soil Does String of Pearls Need?
Fast-draining succulent or cactus mix. Standard potting soil retains too much moisture and causes root rot. Add extra perlite (30-50% by volume) to any mix to improve drainage. The soil should be completely dry within 3-4 days of watering — if it stays wet longer, either the mix is too dense or the pot is too large.
Pot size matters: string of pearls does better slightly pot-bound than in an oversized container. A pot with drainage holes is non-negotiable.
What Temperature Does String of Pearls Prefer?
60-80°F (15-27°C) during active growth. It tolerates temperatures as low as 40°F (4°C) briefly, but sustained cold below 50°F (10°C) causes damage. In summer, it can handle warmth above 85°F as long as watering is reduced (the plant may semi-dormant in hot summers — this is normal).
What Humidity Does String of Pearls Need?
Low to average — 30-50% is fine. String of pearls is adapted to arid conditions and does not need the high humidity that tropical houseplants require. Standard household air in most climates is adequate. Avoid placing near humidifiers or in high-humidity rooms like bathrooms, which can cause root rot.
How Often Should You Fertilize String of Pearls?
Once per month during active growth (spring and autumn) with a diluted balanced fertilizer or a succulent-specific formula. Do not fertilize in winter or during summer dormancy. Overfertilizing causes soft, squishy growth that breaks easily and is prone to pest problems.
Does String of Pearls Go Dormant?
Yes — twice. String of pearls has two semi-dormant periods: one in summer (when heat and reduced light in many indoor environments slow growth) and one in winter (in response to cold and low light).
During semi-dormancy, reduce watering significantly. The beads may look slightly less plump during dormancy — this is normal as long as the soil is dry and the beads don’t look mushy. Growth resumes when temperatures moderate in spring and autumn (the active growing seasons for this South African plant).
How to Get String of Pearls to Bloom
Mature plants produce small, daisy-like white flowers with a cinnamon scent in late winter or early spring. Blooming is triggered by a combination of bright light throughout the growing season, a cooler rest period in winter (letting temperatures drop to 55-60°F), and reducing watering.
Most indoor plants don’t bloom because they stay in consistent warm temperatures year-round. A cool, bright windowsill in winter gives the plant the rest period it needs to flower in spring.
Is String of Pearls Toxic to Cats and Dogs?
Yes. The ASPCA lists string of pearls as toxic to dogs and cats. The toxic components are pyrrolizidine alkaloids — the same class of compounds found in many plants in the Senecio/Curio family. Ingestion causes drooling, vomiting, diarrhea, lethargy, and in significant quantities, liver damage.
Keep string of pearls in hanging positions or on shelves that cats cannot reach. The trailing stems are particularly attractive to cats and dogs, making this plant a higher risk than some others. If ingestion is suspected, contact your vet or the ASPCA Animal Poison Control Center.
Common Problems With String of Pearls
Why Are the Beads Falling Off?
Usually overwatering. When the soil stays wet too long, the beads become waterlogged, turn soft, and detach from the stems. Other causes include physical impact (the beads detach easily when touched roughly) and low light combined with cool temperatures. Reduce watering and move to a brighter, warmer location.
Why Are the Stems Growing Long With Widely Spaced Beads?
Etiolation — the plant is stretching toward light. This happens when light is insufficient. Move to the brightest available spot with some direct sun. Trim leggy stems and propagate the healthy parts; a more compact plant will grow from the base.
Why Are the Beads Turning Brown or Yellow?
Brown, dry beads: sunburn from direct afternoon sun or underwatering. Yellow, soft beads: overwatering. Brown only at stem tips: root rot blocking water uptake from below. Diagnose by checking soil moisture and whether the discoloration starts at tips or throughout the strand.
How to Propagate String of Pearls
Stem cuttings root easily. Take 3-4 inch cuttings, remove the bottom few beads to expose the stem node, and place on slightly moist cactus mix (don’t bury — lay them on the surface and let the nodes contact the soil). Alternatively, place cuttings in water and wait 1-2 weeks for roots. At room temperature in bright light, roots develop within 2-3 weeks.
Spring and early autumn give the best propagation success. Avoid propagating in mid-summer or mid-winter during the semi-dormant phases.
Common Mistakes With String of Pearls
Watering on a fixed schedule. The single biggest killer. Water only when the beads tell you they’re thirsty (slightly soft or lost roundness). This changes drastically with season, pot size, and light level — a schedule cannot account for it.
Putting it in a dark corner. The plant looks dramatic as a trailing decoration, but without 4+ hours of bright light it slowly declines over months. A well-lit windowsill is mandatory, not optional.
Using regular potting mix. Standard potting mix retains water 2-3 times longer than string of pearls needs. Always add perlite or use a dedicated succulent mix.
Frequently Asked Questions
Why is my string of pearls shriveling even though I just watered it?
If the beads are soft rather than firm, root rot is likely — the roots can no longer absorb water. Remove from pot, trim dark or mushy roots, and repot in dry mix. If the beads are firm but wrinkled, the soil may have dried too fast — a mix that’s too gritty can cause this.
Is string of pearls hard to keep alive?
It has a reputation for difficulty, but most failures come from overwatering. In bright light with very infrequent watering and fast-draining soil, it is surprisingly resilient.
How long do string of pearls strands grow?
In ideal conditions (bright light, correct watering), strands reach 2-3 feet over 1-2 growing seasons. Growth rate slows significantly without adequate light.
What is the difference between Senecio and Curio rowleyanus?
They refer to the same plant — string of pearls. The name changed when taxonomists reclassified the plant from the genus Senecio to Curio based on updated molecular data. Both names are still widely used; Curio rowleyanus is the currently accepted scientific name.