Soil & potting mix
Best soil for String of Spades (Ceropegia woodii 'Heartless')
Also called Ceropegia Heartless.
More about string of spades
About String of Spades
Ceropegia woodii 'Heartless' · also called Ceropegia Heartless · houseplant
Ceropegia woodii 'Heartless', or String of Spades, is a trailing semi-succulent whose leaves are elongated and pointed like a spade rather than a rounded heart, with silver marbling over green. It cascades from baskets and forms bead-like tubers along the stems. Care matches the rosary vine: bright indirect light, gritty soil, dry-down watering, and ASPCA pet-safe.
Preferred mix: Gritty, free-draining succulent or cactus mix
Watch for — 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.
Why string of spades needs this mix
String of Spades stores water in its leaves and stems, so it wants a free-draining, gritty mix that dries out fully between waterings — not a moisture-holding one.
- String of Spades carries its own water supply in its thick tissue, so the soil's job is to drain fast and then get out of the way.
- Its roots are adapted to short wet spells followed by long dry ones — a mix that stays damp removes the dry phase they depend on.
- A gritty mix also keeps the plant compact and well-coloured rather than soft, leggy and prone to collapse.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons string of spades struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Standard potting compost on its own stays wet far too long for string of spades; the lower leaves and stem base go soft and translucent first.
- Big plastic pots full of dense mix hold a wet core long after the surface looks dry — that hidden wet zone is where rot starts.
- Anything sold as "moisture control" is the opposite of what this plant wants.
Treating string of spades like a leafy houseplant and using plain compost. It needs at least half its volume as grit, perlite or pumice to survive long term.
pH — does it matter for string of spades?
pH is not a concern for string of spades — anything from mildly acidic to neutral (6.0-7.0) works. Get the drainage right and pH looks after itself.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
A good bagged "cactus and succulent" mix works for string of spades if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.
Drainage and the pot
Use a pot with a drainage hole and empty the saucer within minutes of watering. Terracotta is more forgiving than glazed or plastic because it dries the rootball faster.
This mix decomposes slowly, so string of spades only needs repotting every 2-3 years — mainly to refresh the grit and check the roots are firm and pale. When the time comes, our repotting guide for string of spades covers the timing and technique step by step.
String of Spades soil — frequently asked questions
What is the best soil mix for string of spades?
2 parts standard cactus or succulent compost : 1 part perlite or pumice : 1 part coarse grit or coarse sand. String of Spades carries its own water supply in its thick tissue, so the soil's job is to drain fast and then get out of the way.
Can I use normal potting soil for string of spades?
Standard potting compost on its own stays wet far too long for string of spades; the lower leaves and stem base go soft and translucent first. A good bagged "cactus and succulent" mix works for string of spades if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.
Does string of spades need a special pH?
pH is not a concern for string of spades — anything from mildly acidic to neutral (6.0-7.0) works. Get the drainage right and pH looks after itself.
Should I buy a bagged mix or make my own for string of spades?
A good bagged "cactus and succulent" mix works for string of spades if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.
How often should I refresh the soil for string of spades?
This mix decomposes slowly, so string of spades only needs repotting every 2-3 years — mainly to refresh the grit and check the roots are firm and pale. Use a pot with a drainage hole and empty the saucer within minutes of watering. Terracotta is more forgiving than glazed or plastic because it dries the rootball faster.
Keep reading
- String of Spades care — the full brief (light, water, humidity, problems, pet safety)
- How often to water string of spades — the schedule the mix feeds into
- Repotting string of spades — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- How often to water succulents — the soak-and-dry method
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
- Best soil for snake plant
- Best soil for dracaena
- Best soil for peperomia
- All 1284 soil and potting-mix guides in the Growli library