Fertilising guide
How to fertilise Gasteria (Ox Tongue) (Gasteria carinata)— schedule & NPK
Also called Ox Tongue, Ox-tongue, Keeled Ox Tongue, Bredasdorp Gasteria, Cow's Tongue.
More about gasteria (ox tongue)
About Gasteria (Ox Tongue)
Gasteria carinata · also called Ox Tongue, Ox-tongue · houseplant
Gasteria carinata, the keeled ox tongue, is a slow-growing South African succulent with thick, keeled, tongue-shaped leaves that clump into tidy rosettes. It thrives on bright indirect light, infrequent watering and gritty soil, making it forgiving for beginners. Not individually ASPCA-listed, so treat as mildly toxic and verify pet safety with a vet.
Growth habit: Slow-growing, stemless clumping succulent that proliferates from the base to form small dense colonies. Thick, fleshy, triangular to tongue-shaped leaves with a distinct keel on the underside are arranged in a fan that matures toward a loose rosette; leaf surfaces are spotted in transverse bands and may be smooth or rough with tubercles.
Watch for — Etiolation / pale, stretched growth: Insufficient light makes the centre pale and the plant stretch and deform. Move to a brighter spot with a couple of hours of gentle direct sun to keep it compact.
What fertiliser gasteria (ox tongue) actually wants — and why
Gasteria (Ox Tongue) is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 gasteria (ox tongue): 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 gasteria (ox tongue), 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 gasteria (ox tongue):
Feed lightly during the growing season only, about every 2 months in spring and summer with a diluted cactus/succulent fertiliser. Skip or greatly reduce feeding in autumn and winter. A brief cool, dry rest around 12-15 C in winter helps encourage the arching racemes of pink, green-striped tubular flowers. Treat that as every 2 months between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when gasteria (ox tongue) 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 gasteria (ox tongue)
Half strength is the safe default for gasteria (ox tongue) — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water gasteria (ox tongue) first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the gasteria (ox tongue) watering schedule.
Signs you are over-feeding gasteria (ox tongue)
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for gasteria (ox tongue):
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding gasteria (ox tongue)
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full gasteria (ox tongue) care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of gasteria (ox tongue) with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for gasteria (ox tongue)
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 gasteria (ox tongue) — frequently asked questions
What fertiliser does gasteria (ox tongue) need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Gasteria (Ox Tongue) is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed gasteria (ox tongue)?
Feed lightly during the growing season only, about every 2 months in spring and summer with a diluted cactus/succulent fertiliser. Skip or greatly reduce feeding in autumn and winter. A brief cool, dry rest around 12-15 C in winter helps encourage the arching racemes of pink, green-striped tubular flowers. Feed lightly during the growing season only, about every 2 months in spring and summer with a diluted cactus/succulent fertiliser. Skip or greatly reduce feeding in autumn and winter. A brief cool, dry rest around 12-15 C in winter helps encourage the arching racemes of pink, green-striped tubular flowers. Treat that as every 2 months between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for gasteria (ox tongue)?
Half strength is the safe default for gasteria (ox tongue) — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding gasteria (ox tongue) look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding gasteria (ox tongue) year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of gasteria (ox tongue)?
Flush the pot of gasteria (ox tongue) with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- Gasteria (Ox Tongue) care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water gasteria (ox tongue) — 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 609 fertilising guides in the Growli library