Fertilising guide
How to fertilise Haworthiopsis Viscosa (Haworthiopsis viscosa)— schedule & NPK
Also called Three-ranked haworthia, Sticky haworthia.
More about haworthiopsis viscosa
About Haworthiopsis Viscosa
Haworthiopsis viscosa · also called Three-ranked haworthia, Sticky haworthia · houseplant
Haworthiopsis viscosa is a slow-growing South African succulent whose triangular, dark-green leaves stack in three neat vertical rows, forming a column-like tower. It thrives in bright indirect light, gritty fast-draining mix, and infrequent watering. Tough and pet-safe, it suits sunny windowsills and offsets readily, making it an easy, forgiving collector's succulent.
Growth habit: Slow-growing, clump-forming succulent with stiff triangular leaves arranged in three distinct vertical ranks, creating an upright columnar tower that offsets at the base to form tight clusters over time.
What fertiliser haworthiopsis viscosa actually wants — and why
Haworthiopsis Viscosa 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 haworthiopsis viscosa: 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 haworthiopsis viscosa, 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 haworthiopsis viscosa:
Feed lightly once or twice during spring and summer with a balanced succulent fertiliser diluted to half strength. Do not feed in autumn or winter when growth stalls; over-feeding causes weak, etiolated growth. Treat that as sparingly through the growing season 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 haworthiopsis viscosa 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 haworthiopsis viscosa
Half strength is the safe default for haworthiopsis viscosa — 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 haworthiopsis viscosa first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the haworthiopsis viscosa watering schedule.
Signs you are over-feeding haworthiopsis viscosa
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for haworthiopsis viscosa:
- 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 haworthiopsis viscosa
- 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 haworthiopsis viscosa care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of haworthiopsis viscosa 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 haworthiopsis viscosa
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 haworthiopsis viscosa — frequently asked questions
What fertiliser does haworthiopsis viscosa 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. Haworthiopsis Viscosa 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 haworthiopsis viscosa?
Feed lightly once or twice during spring and summer with a balanced succulent fertiliser diluted to half strength. Do not feed in autumn or winter when growth stalls; over-feeding causes weak, etiolated growth. Feed lightly once or twice during spring and summer with a balanced succulent fertiliser diluted to half strength. Do not feed in autumn or winter when growth stalls; over-feeding causes weak, etiolated growth. Treat that as sparingly through the growing season 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 haworthiopsis viscosa?
Half strength is the safe default for haworthiopsis viscosa — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding haworthiopsis viscosa 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 haworthiopsis viscosa 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 haworthiopsis viscosa?
Flush the pot of haworthiopsis viscosa 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
- Haworthiopsis Viscosa care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water haworthiopsis viscosa — 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 2464 fertilising guides in the Growli library