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Plant care

String of Spades (Ceropegia Heartless) care

Ceropegia woodii 'Heartless'

Also called Ceropegia Heartless.

RHS H1cUSDA 10-12Pet-safeIndoor Strands trail to 0.6-2 m (2-6 ft) over time

Watering rhythm

10-14days

When the soil is nearly dry, roughly every 10-14 days

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Light

Bright indirect light (just back from a sunny window)

Soil

Gritty, free-draining succulent or cactus mix

Humidity

30-50%

Temp

18-26°C

Pet safety

Pet-safe

Mature size

Strands trail to 0.6-2 m (2-6 ft) over time

Care at a glance

Light

Bright but filtered. String of Spades burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright indirect light keeps strands compact and the silver patterning crisp; a little gentle direct sun helps. In low light the leaves space out and the vine grows leggy. Protect from harsh midday sun, which can scorch the slim leaves. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering string of spades: when the soil is nearly dry, roughly every 10-14 days. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water as a succulent: soak thoroughly, then let the mix dry almost completely before watering again. The thickened leaves and tubers store moisture, so overwatering — shown by soft, translucent leaves — is the main danger. Reduce watering markedly in winter.

Soil and pot

String of Spades grows best in gritty, free-draining succulent or cactus mix. Use a cactus/succulent mix or boost a standard mix with perlite, pumice, or coarse sand for sharp drainage. The shallow roots and tubers rot in heavy, soggy soil. A pot with drainage holes is essential. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

String of Spades sits happiest at around 30-50% humidity and 18-26°C (65-80°F). Average to low household humidity suits it best; as a semi-succulent it dislikes humid, stagnant air that promotes rot. No misting or humidifier needed. Good airflow keeps the strands healthy. If you keep the room above 18 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed string of spades sparingly. Feed lightly — once a month in spring and summer with a balanced or cactus fertiliser at half to quarter strength. It is easily overfed, which can burn the fine roots. Withhold fertiliser in autumn and winter. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on string of spades in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Leggy strands with sparse leaves — Widely spaced leaves and bare runs of stem mean too little light. Move to a brighter indirect spot and trim long bare strands; new compact growth follows as light improves.
  • Overwatering and tuber rot — Soft, translucent, mushy leaves and rotting stems signal soggy soil. Use gritty mix, let it dry almost fully between waterings, and cut back sharply in winter.
  • Sunburn on slim leaves — The narrow spade leaves can scorch in harsh direct sun, showing bleached or brown patches. Provide bright but filtered light and acclimatise gradually to brighter spots.
  • Aphids and mealybugs — Sap-feeders cluster on new growth and flower stalks. Rinse off or treat with insecticidal soap or alcohol and repeat; inspect the tangled strands closely to catch them early.

Propagation

Easy from strands laid on moist gritty mix (the nodes root readily), from the aerial tubers (beads) which sprout new vines, or from stem cuttings rooted in water or soil. Propagate in spring or summer; the cultivar comes true through vegetative propagation. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

String of Spades is pet-safe. ASPCA-listed as non-toxic to cats and dogs. Ceropegia woodii (rosary vine / string of hearts) is on the ASPCA non-toxic list, so this 'Heartless' cultivar is pet-safe; eating a large amount of strands may still cause mild stomach upset, and the dangling vines can tempt playful cats. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

String of Spades care — frequently asked questions

What is the common name for Ceropegia woodii 'Heartless'?

Ceropegia woodii 'Heartless' is most commonly called String of Spades, but it is also known as Ceropegia Heartless. The names refer to the same species, so care instructions for String of Spades apply identically to anything sold as Ceropegia Heartless.

How much light does string of spades need?

String of Spades grows best in bright indirect light (just back from a sunny window). Bright indirect light keeps strands compact and the silver patterning crisp; a little gentle direct sun helps. In low light the leaves space out and the vine grows leggy. Protect from harsh midday sun, which can scorch the slim leaves.

How often should I water string of spades?

Water string of spades when the soil is nearly dry, roughly every 10-14 days. Water as a succulent: soak thoroughly, then let the mix dry almost completely before watering again. The thickened leaves and tubers store moisture, so overwatering — shown by soft, translucent leaves — is the main danger. Reduce watering markedly in winter. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is string of spades toxic to cats and dogs?

String of Spades is pet-safe. ASPCA-listed as non-toxic to cats and dogs. Ceropegia woodii (rosary vine / string of hearts) is on the ASPCA non-toxic list, so this 'Heartless' cultivar is pet-safe; eating a large amount of strands may still cause mild stomach upset, and the dangling vines can tempt playful cats.

What USDA hardiness zone does string of spades grow in?

String of Spades is rated for USDA zone 10-12 (grown indoors in most US homes) and RHS hardiness H1c. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

String of Spades deep-dive guides

Every aspect of string of spades care, each with its own calibrated guide:

Featured in these plant shortlists

String of Spades qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

String of Spades is also commonly called Ceropegia Heartless.