String of pearls care guide

How to read the beads

String of pearls (Curio rowleyanus, formerly Senecio rowleyanus) stores water in its spherical bead-like leaves. This makes the beads an extremely reliable real-time indicator of the plant's condition. Before doing anything else to your string of pearls, look at the beads.

This read-before-you-water habit eliminates guessing and prevents both overwatering and underwatering. The beads are more reliable than any calendar or soil moisture estimate.

Light requirements

This is where most string of pearls fail: they need far more light than people expect. Native to the dry coastal cliffs of South Africa, string of pearls grows in full sun or very bright partial shade in the wild. Indoors it needs the brightest window you have.

In good light, string of pearls produces dense strands of plump, evenly-spaced round beads. The plant grows vigorously, cascading over the edges of its pot in long trails.

In insufficient light, the beads shrink and the gaps between them on the strand lengthen as the plant stretches toward any available light. The strands become thin and spindly, the plant looks increasingly sparse, and it becomes less and less able to handle any water without rotting. Low light and root rot are a self-reinforcing cycle for this plant.

Best window direction

A south-facing window is the ideal placement. String of pearls actually benefits from a few hours of direct indoor sun daily, which a south window provides. Unlike tender tropical plants that scorch in direct sun, this plant evolved in full sun conditions and welcomes the intensity.

A west-facing window is an excellent second choice, providing several hours of afternoon direct sun and bright indirect light for the rest of the day. A west window in summer gives string of pearls very close to what it gets in its native habitat.

An east-facing window is borderline. The gentle morning sun provides less total light than south or west windows. Some growers succeed with east windows by placing the plant right at the glass to maximize exposure, but growth will be slower and denser than in a south or west window.

A north-facing window is insufficient. String of pearls will decline slowly in a north window: beads shrink, strands thin, and the plant eventually stops growing before dying from rot that it cannot recover from due to inadequate photosynthesis.

String of pearls also does exceptionally well under grow lights set to 14 to 16 hours per day at a close distance, making it a good candidate for indoor setups without ideal natural light.

Watering

Water string of pearls the same way you water other succulents: thoroughly, then wait for complete dryness. When you water, pour until water runs freely from the drainage holes, saturating the entire root zone. Then do not water again until the soil is completely dry and the beads start to show the first signs of slight wrinkling.

In summer in a bright spot this might be every 14 to 21 days. In winter, once a month or even less. Use the beads as your primary guide; soil dryness is secondary.

Important: once beads go mushy and translucent, no amount of drying out will save those individual beads. But the plant may survive if you catch root rot early. Remove the plant from its pot, trim away any soft or rotten roots and strands, let the remaining healthy stems callous for a day, and repot in fresh dry cactus mix.

Soil and potting

String of pearls needs the fastest-draining soil you can provide. A cactus and succulent mix with additional perlite (roughly 50 percent perlite by volume) is ideal. The goal is soil that becomes nearly dry within a day or two of watering. Any soil that holds moisture for more than a few days puts this plant at risk.

Terracotta pots are strongly preferred. The porous clay wicks moisture from the soil and dramatically speeds up drying between waterings. Plastic pots retain moisture much longer and increase root rot risk significantly.

String of pearls does well in hanging baskets, which allow the strands to trail freely and expose the pot to airflow on all sides, helping the soil dry faster. If using a hanging basket, check moisture more frequently as hanging pots often dry faster than floor pots.

Keep the pot relatively small and proportionate to the plant. Excess soil around the roots holds moisture the roots cannot access and increases rot risk.

Propagation

String of pearls is one of the easiest succulents to propagate. The most effective method:

1. Identify a healthy strand with plump, evenly-spaced beads and no signs of rot
2. Cut a section 3 to 4 inches long with clean scissors
3. Remove the beads from the bottom inch to expose the bare stem
4. Let the cutting sit in dry air for a few hours to callous the cut end
5. Place the bare stem section on top of or just below the surface of moist cactus mix
6. Place in bright indirect light and mist very lightly every few days
7. Roots develop from nodes along the stem within 2 to 4 weeks

An even simpler approach for filling in a sparse plant: lay a healthy strand on top of the soil surface of the mother plant's pot, pressing it lightly against the soil. Roots will develop where the strand touches the soil. Pin it down with a bent paperclip or small stone if needed. This is how the plant spreads in nature.

String of pearls does not propagate well from individual beads alone. The growing points are on the stem, not the beads themselves, so you need stem tissue with the beads attached.

Common problems

Shriveling, shrinking beads

The plant needs water. This is the most reliable sign of underwatering. Water thoroughly and beads should plump back up within a day. If they do not recover after watering, the roots may be damaged from prior rot and unable to take up water effectively.

Mushy, translucent, or flat beads

Overwatering or root rot. This is the most common cause of string of pearls death. Remove from the pot immediately, trim away soft stems and mushy roots, let dry completely, and repot in fresh fast-draining mix. Increase the proportion of perlite in the new mix and water much less frequently going forward.

Sparse strands with small, widely-spaced beads

Insufficient light. The plant is stretching toward any available light source. Move it to a south or west window. Note that existing sparse strands will not fill back in; the improvement shows up in new growth from the growing tips.

Beads turning yellow

Overwatering in most cases. Reduce watering frequency significantly. Less commonly, yellowing can indicate too much direct sun causing heat stress, in which case the yellow beads are on the side facing the strongest light.

Strands dropping off

If whole strands detach at the base with minimal force, the base of the plant where strands meet the soil may be rotting. This is a sign of overwatering concentrated at the surface. Let the top of the soil dry out more and avoid getting water on the stem base and beads near the soil.

Mealybugs

Check the nodes where beads meet the stem, and the growing tips. Treat with isopropyl alcohol on a cotton swab or neem oil spray applied weekly for several weeks.

String of pearls relatives worth knowing

Toxicity

String of pearls is toxic to cats, dogs, and humans. Ingestion causes vomiting, diarrhea, lethargy, and drooling in pets. All parts of the plant are considered toxic. Because of its trailing habit, it is particularly accessible to curious cats that may bat at or chew the dangling strands. Hang it well out of reach of pets or choose a different trailing plant for pet households.

Frequently asked questions