Fertilising guide
How to fertilise Cardamom (Elettaria cardamomum)— schedule & NPK
Also called Cardamom, Green Cardamom, True Cardamom.
More about cardamom
About Cardamom
Elettaria cardamomum · also called Cardamom, Green Cardamom · herb
Cardamom is a tropical rhizomatous perennial grown for its aromatic seed pods, the world's third most expensive spice. Indoors it makes an elegant foliage plant with strap-like leaves and occasional white-and-purple flowers. It requires warmth, high humidity, and filtered light to thrive.
Growth habit: Clump-forming, rhizomatous perennial with cane-like stems and long lance-shaped leaves
What fertiliser cardamom actually wants — and why
Cardamom is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.
A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed.
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 cardamom: 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 cardamom, 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 cardamom:
Feed with a balanced liquid fertiliser (e.g. 10-10-10) every 2–3 weeks during the growing season (spring–summer). Reduce to monthly in autumn and withhold in winter. A high-potassium feed encourages pod production in mature plants. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.
The dormant-season rule matters more than the exact interval: skip feeding entirely when cardamom 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 cardamom
Half strength is a sensible default for cardamom — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
Feeding always goes onto already-damp soil, never dry roots — water cardamom first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the cardamom watering schedule.
Signs you are over-feeding cardamom
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for cardamom:
- Fast, soft, pale growth with diluted, less aromatic flavour.
- Early bolting (running to flower) and a bitter edge.
- Salt crust and scorched tips on container plants.
Signs you are under-feeding cardamom
- Pale, slow regrowth after cutting and small leaves.
- A tired, stalled plant that cannot keep up with harvesting.
- Yellowing older leaves in a long-spent pot.
If the symptoms point at watering, light or roots rather than nutrition, the full cardamom care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Pot-grown cardamom builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.
Organic vs synthetic feeds for cardamom
Organic options
A diluted seaweed feed or worm-casting tea keeps soft growth coming without overdoing it. UK: dilute seaweed or Westland; US: Espoma Garden-tone or Neptune's Harvest. Gentle, hard to overdo, flavour-friendly.
Synthetic / liquid feeds
A balanced liquid feed at half strength through harvesting — UK: Phostrogen, Baby Bio or Westland; US: Miracle-Gro all-purpose at half strength. Fast regrowth; just do not overdo the nitrogen.
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 cardamom — frequently asked questions
What fertiliser does cardamom need?
A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed. Cardamom is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.
How often should I feed cardamom?
Feed with a balanced liquid fertiliser (e.g. 10-10-10) every 2–3 weeks during the growing season (spring–summer). Reduce to monthly in autumn and withhold in winter. A high-potassium feed encourages pod production in mature plants. Feed with a balanced liquid fertiliser (e.g. 10-10-10) every 2–3 weeks during the growing season (spring–summer). Reduce to monthly in autumn and withhold in winter. A high-potassium feed encourages pod production in mature plants. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.
What strength of feed for cardamom?
Half strength is a sensible default for cardamom — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
What does over-feeding cardamom look like?
Fast, soft, pale growth with diluted, less aromatic flavour. Early bolting (running to flower) and a bitter edge. Salt crust and scorched tips on container plants. Over-feeding cardamom with strong nitrogen is the usual mistake — it grows fast and lush but the leaves turn bland and it bolts to flower sooner, ending the useful harvest early.
Should I flush the soil of cardamom?
Pot-grown cardamom builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.
Keep reading
- Cardamom care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water cardamom — 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 lovage
- How to fertilise common sorrel
- How to fertilise french sorrel
- All 6887 fertilising guides in the Growli library