Fertilising guide
How to fertilise String of Spades (Ceropegia woodii 'Heartless')— schedule & NPK
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.
Growth habit: Trailing semi-succulent vine with spade-shaped leaves; strands cascade from hanging baskets or shelves and form aerial tubers (beads) at the nodes.
Watch for — 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.
What fertiliser string of spades actually wants — and why
String of Spades is a light-feeding succulent — a gentle, low-nitrogen feed a few times in growth keeps it plump without forcing the weak, stretched growth over-feeding causes.
A cactus and succulent formula or a diluted balanced feed with modest, even numbers. Avoid high-nitrogen plant foods — they make a succulent etiolate and grow soft, fracture-prone tissue.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for string of spades: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed string of spades, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For string of spades:
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. Keep that to once a month between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when string of spades is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for string of spades
Quarter to half strength at most for string of spades. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
Feeding always goes onto already-damp soil, never dry roots — water string of spades first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the string of spades watering schedule.
Signs you are over-feeding string of spades
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for string of spades:
- Stretched, leggy, pale growth with widely spaced leaves.
- A white salt crust on the soil or around the pot rim.
- Brown, crisped leaf tips and edges.
- Soft, mushy tissue at the base — over-feeding plus damp soil rots it.
Signs you are under-feeding string of spades
- Uncommon — succulents tolerate lean conditions well.
- Very slow growth and dull, faded colour over a long period.
- Older leaves shed faster than new ones replace them in a tired old mix.
If the symptoms point at watering, light or roots rather than nutrition, the full string of spades care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of string of spades until it drains clear, and refresh the gritty mix every 2-3 years.
Organic vs synthetic feeds for string of spades
Organic options
A heavily diluted seaweed or worm-casting feed once or twice in summer. UK: a drop of Westland seaweed feed; US: quarter-strength Espoma Cactus! or Dr. Earth liquid. Fresh free-draining mix matters more than any feed.
Synthetic / liquid feeds
A dedicated cactus/succulent liquid at quarter to half strength — UK: Baby Bio Cacti & Succulent Drip Feeders or Westland; US: Miracle-Gro Succulent Plant Food or Schultz Cactus Plus.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising string of spades — frequently asked questions
What fertiliser does string of spades need?
A cactus and succulent formula or a diluted balanced feed with modest, even numbers. Avoid high-nitrogen plant foods — they make a succulent etiolate and grow soft, fracture-prone tissue. String of Spades is a light-feeding succulent — a gentle, low-nitrogen feed a few times in growth keeps it plump without forcing the weak, stretched growth over-feeding causes.
How often should I feed string of spades?
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. 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. Keep that to once a month between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
What strength of feed for string of spades?
Quarter to half strength at most for string of spades. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
What does over-feeding string of spades look like?
Stretched, leggy, pale growth with widely spaced leaves. A white salt crust on the soil or around the pot rim. Brown, crisped leaf tips and edges. Soft, mushy tissue at the base — over-feeding plus damp soil rots it. Feeding string of spades like a leafy houseplant is the classic error — it produces a flush of pale, stretched, floppy growth that never firms up and is prone to rot at the base.
Should I flush the soil of string of spades?
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of string of spades until it drains clear, and refresh the gritty mix every 2-3 years.
Keep reading
- String of Spades care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water string of spades — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 1284 fertilising guides in the Growli library