Fertilising guide
How to fertilise Living Stones (Lithops karasmontana)— schedule & NPK
Also called Karas Mountains Living Stone, Flowering Stones.
More about living stones
About Living Stones
Lithops karasmontana · also called Karas Mountains Living Stone, Flowering Stones · houseplant
Lithops karasmontana is a mimicry succulent from Namibia's Karas Mountains, its paired fused leaves disguised as patterned pebbles. Each plant is mostly a single pair of leaves with a fissure that splits to reveal a daisy-like white flower in autumn. It demands extremely sparing water on a strict seasonal cycle and the grittiest possible drainage to thrive.
Growth habit: Tiny stemless geophyte: usually one (sometimes several) pair of fused, truncate leaves flush with the soil, renewing each year as a new pair grows up through the old. Clumps slowly with age into small colonies of pebble-like heads.
What fertiliser living stones actually wants — and why
Living Stones 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 living stones: 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 living stones, 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 living stones:
Essentially none required. At most, apply a dilute (quarter-strength) low-nitrogen cactus feed once during the active autumn growth period. Lithops grow in nutrient-poor ground and excess feeding causes soft, swollen, rot-prone bodies. Keep that to sparingly through the growing season 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 living stones 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 living stones
Quarter to half strength at most for living stones. 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 living stones first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the living stones watering schedule.
Signs you are over-feeding living stones
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for living stones:
- 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 living stones
- 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 living stones 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 living stones until it drains clear, and refresh the gritty mix every 2-3 years.
Organic vs synthetic feeds for living stones
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 living stones — frequently asked questions
What fertiliser does living stones 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. Living Stones 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 living stones?
Essentially none required. At most, apply a dilute (quarter-strength) low-nitrogen cactus feed once during the active autumn growth period. Lithops grow in nutrient-poor ground and excess feeding causes soft, swollen, rot-prone bodies. Essentially none required. At most, apply a dilute (quarter-strength) low-nitrogen cactus feed once during the active autumn growth period. Lithops grow in nutrient-poor ground and excess feeding causes soft, swollen, rot-prone bodies. Keep that to sparingly through the growing season between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
What strength of feed for living stones?
Quarter to half strength at most for living stones. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
What does over-feeding living stones 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 living stones 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 living stones?
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of living stones until it drains clear, and refresh the gritty mix every 2-3 years.
Keep reading
- Living Stones care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water living stones — 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