Fertilising guide
How to fertilise Lehmann's Ice Plant (Delosperma lehmannii)— schedule & NPK
Also called Lehmann's Delosperma, Trailing Ice Plant.
More about lehmann's ice plant
About Lehmann's Ice Plant
Delosperma lehmannii · also called Lehmann's Delosperma, Trailing Ice Plant · houseplant
Lehmann's Ice Plant is a prostrate South African succulent from the Aizoaceae family with fleshy, triangular blue-green leaves and bright yellow flowers in spring and summer. Ideal for hanging baskets, rock gardens, and sunny windowsills with minimal watering needs. Regarded as non-toxic and safe for pets.
Growth habit: Prostrate, trailing mat-forming succulent
Watch for — Pale or yellowing leaves: May indicate overwatering or, in bright conditions, a sign of nutrient deficiency. Adjust watering and apply a dilute feed in the growing season.
What fertiliser lehmann's ice plant actually wants — and why
Lehmann's Ice Plant 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 lehmann's ice plant: 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 lehmann's ice plant, 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 lehmann's ice plant:
Feed monthly in spring and summer with a diluted low-nitrogen cactus fertiliser (quarter-strength). Avoid feeding in autumn and winter. Excessive nitrogen encourages lush but weak, rot-prone foliage. Keep that to monthly 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 lehmann's ice plant 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 lehmann's ice plant
Quarter to half strength at most for lehmann's ice plant. 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 lehmann's ice plant first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the lehmann's ice plant watering schedule.
Signs you are over-feeding lehmann's ice plant
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for lehmann's ice plant:
- 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 lehmann's ice plant
- 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 lehmann's ice plant 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 lehmann's ice plant until it drains clear, and refresh the gritty mix every 2-3 years.
Organic vs synthetic feeds for lehmann's ice plant
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 lehmann's ice plant — frequently asked questions
What fertiliser does lehmann's ice plant 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. Lehmann's Ice Plant 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 lehmann's ice plant?
Feed monthly in spring and summer with a diluted low-nitrogen cactus fertiliser (quarter-strength). Avoid feeding in autumn and winter. Excessive nitrogen encourages lush but weak, rot-prone foliage. Feed monthly in spring and summer with a diluted low-nitrogen cactus fertiliser (quarter-strength). Avoid feeding in autumn and winter. Excessive nitrogen encourages lush but weak, rot-prone foliage. Keep that to monthly between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
What strength of feed for lehmann's ice plant?
Quarter to half strength at most for lehmann's ice plant. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
What does over-feeding lehmann's ice plant 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 lehmann's ice plant 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 lehmann's ice plant?
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of lehmann's ice plant until it drains clear, and refresh the gritty mix every 2-3 years.
Keep reading
- Lehmann's Ice Plant care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water lehmann's ice plant — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 11687 fertilising guides in the Growli library