Fertilising guide
How to fertilise Haworthia (Haworthiopsis attenuata)— schedule & NPK
Also called zebra plant, zebra haworthia, pearl plant.
About Haworthia
Haworthiopsis attenuata · also called zebra plant, zebra haworthia · houseplant
Haworthia (now mostly reclassified as Haworthiopsis) is a small rosette succulent from South Africa, well suited to windowsill culture because it tolerates lower light than most succulents. The "zebra plant" common name refers to white horizontal stripes on the leaves. Pet-safe by ASPCA standards.
Haworthia are small rosette succulents native to South Africa, many growing partly buried among rocks and grass tufts in semi-shade, with translucent 'window' tips on their leaves that admit light to the buried photosynthetic tissue.
Feed only sparingly during active growth with a dilute succulent fertiliser; it is adapted to lean soils and needs little supplementary nutrition.
Growth habit: Compact rosette succulent
Watch for — Red or purple flush: Sunburn or cold stress — move to gentler light.
Sources: gardeningknowhow.com, thesill.com
What fertiliser haworthia actually wants — and why
Haworthia 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 haworthia: 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 haworthia, 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 haworthia:
Quarter-strength cactus feed every 6-8 weeks during the growing season. Keep that to every 6-8 weeks 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 haworthia 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 haworthia
Quarter to half strength at most for haworthia. 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 haworthia first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the haworthia watering schedule.
Signs you are over-feeding haworthia
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for haworthia:
- 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 haworthia
- 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 haworthia 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 haworthia until it drains clear, and refresh the gritty mix every 2-3 years.
Organic vs synthetic feeds for haworthia
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 haworthia — frequently asked questions
What fertiliser does haworthia 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. Haworthia 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 haworthia?
Quarter-strength cactus feed every 6-8 weeks during the growing season. Quarter-strength cactus feed every 6-8 weeks during the growing season. Keep that to every 6-8 weeks between spring through early autumn (roughly March to September) and stop entirely once growth slows for winter.
What strength of feed for haworthia?
Quarter to half strength at most for haworthia. Succulents take up very little, and a strong dose burns the fine roots before the plant can use it.
What does over-feeding haworthia 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 haworthia 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 haworthia?
Feed lightly enough and you rarely need to flush, but once a year run plain water through the pot of haworthia until it drains clear, and refresh the gritty mix every 2-3 years.
Keep reading
- Haworthia care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water haworthia — 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 200 fertilising guides in the Growli library