Fertilising guide
How to fertilise Striped Amaryllis (Hippeastrum vittatum)— schedule & NPK
Also called Banded Amaryllis, Striped Hippeastrum, Peruvian Lily.
More about striped amaryllis
About Striped Amaryllis
Hippeastrum vittatum · also called Banded Amaryllis, Striped Hippeastrum · flowering
Hippeastrum vittatum is a South American bulb from the Andes producing large white or pale pink flowers striped with bold red or crimson veins in winter or spring. One of the original species used to breed modern hybrid amaryllis. Popular as a forced indoor bulb. Toxic to cats, dogs, and horses due to lycorine and alkaloids concentrated in the bulb.
Growth habit: Deciduous (with enforced dormancy) or semi-evergreen bulbous perennial
What fertiliser striped amaryllis actually wants — and why
Striped Amaryllis 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 striped amaryllis: 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 striped amaryllis, 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 striped amaryllis:
Once foliage is fully established after flowering, feed every two weeks with a high-potassium liquid fertiliser (e.g. tomato feed) until late summer. This feeds next year's flower bud inside the bulb. Do not feed during dormancy. 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 striped amaryllis 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 striped amaryllis
Half strength is the safe default for striped amaryllis — 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 striped amaryllis first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the striped amaryllis watering schedule.
Signs you are over-feeding striped amaryllis
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for striped amaryllis:
- 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 striped amaryllis
- 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 striped amaryllis care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of striped amaryllis 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 striped amaryllis
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 striped amaryllis — frequently asked questions
What fertiliser does striped amaryllis 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. Striped Amaryllis 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 striped amaryllis?
Once foliage is fully established after flowering, feed every two weeks with a high-potassium liquid fertiliser (e.g. tomato feed) until late summer. This feeds next year's flower bud inside the bulb. Do not feed during dormancy. Once foliage is fully established after flowering, feed every two weeks with a high-potassium liquid fertiliser (e.g. tomato feed) until late summer. This feeds next year's flower bud inside the bulb. Do not feed during dormancy. 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 striped amaryllis?
Half strength is the safe default for striped amaryllis — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding striped amaryllis 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 striped amaryllis 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 striped amaryllis?
Flush the pot of striped amaryllis 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
- Striped Amaryllis care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water striped amaryllis — 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 dahlia 'rip city'
- How to fertilise dahlia 'senior ball'
- How to fertilise dahlia 'akita'
- All 11687 fertilising guides in the Growli library