Fertilising guide
How to fertilise Fireworks Globe Amaranth (Gomphrena haageana)— schedule & NPK
Also called Fireworks Gomphrena, Strawberry Fields Globe Amaranth, Haage Globe Amaranth.
More about fireworks globe amaranth
About Fireworks Globe Amaranth
Gomphrena haageana · also called Fireworks Gomphrena, Strawberry Fields Globe Amaranth · flowering
Fireworks Globe Amaranth is a tall, dramatic annual bearing elongated, star-burst-shaped inflorescences in vivid orange-red on long stems ideal for cutting and drying. Exceptionally heat and drought tolerant, it blooms prolifically from midsummer to frost. Not listed as toxic by the ASPCA; considered safe around pets.
Growth habit: Upright, branching annual
What fertiliser fireworks globe amaranth actually wants — and why
Fireworks Globe Amaranth 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 fireworks globe amaranth: 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 fireworks globe amaranth, 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 fireworks globe amaranth:
A single application of a balanced slow-release granular fertiliser at planting is adequate in most soils. Avoid repeated feeding as excessive nutrients reduce the prolific flower production that makes Fireworks so distinctive. Container plants benefit from one dilute balanced liquid feed per month. 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 fireworks globe amaranth 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 fireworks globe amaranth
Half strength is the safe default for fireworks globe amaranth — 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 fireworks globe amaranth first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the fireworks globe amaranth watering schedule.
Signs you are over-feeding fireworks globe amaranth
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for fireworks globe amaranth:
- 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 fireworks globe amaranth
- 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 fireworks globe amaranth care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of fireworks globe amaranth 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 fireworks globe amaranth
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 fireworks globe amaranth — frequently asked questions
What fertiliser does fireworks globe amaranth 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. Fireworks Globe Amaranth 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 fireworks globe amaranth?
A single application of a balanced slow-release granular fertiliser at planting is adequate in most soils. Avoid repeated feeding as excessive nutrients reduce the prolific flower production that makes Fireworks so distinctive. Container plants benefit from one dilute balanced liquid feed per month. A single application of a balanced slow-release granular fertiliser at planting is adequate in most soils. Avoid repeated feeding as excessive nutrients reduce the prolific flower production that makes Fireworks so distinctive. Container plants benefit from one dilute balanced liquid feed per month. 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 fireworks globe amaranth?
Half strength is the safe default for fireworks globe amaranth — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding fireworks globe amaranth 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 fireworks globe amaranth 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 fireworks globe amaranth?
Flush the pot of fireworks globe amaranth 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
- Fireworks Globe Amaranth care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water fireworks globe amaranth — 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 campanula portenschlagiana
- How to fertilise campanula poscharskyana
- How to fertilise veronicastrum virginicum
- All 11687 fertilising guides in the Growli library