Best Fertiliser for Cardamom:
NPK Guide, Schedule & Deficiency Fixes
The exact NPK ratios cardamom needs, when to switch to potassium-rich tomato feed, how to use Epsom salt for magnesium, and a dose calculator for your pot size — all backed by Spices Board India and ICRI data.
Cardamom needs a balanced NPK fertiliser (10:10:10) monthly from April–September, switching to a potassium-rich feed (tomato feed or 5:10:15 NPK) from June onwards when flowering begins. Add magnesium sulfate (Epsom salt) monthly as a foliar spray — ICRI soil surveys found magnesium deficiency widespread in cardamom-growing soils. Apply zinc sulfate foliar spray twice yearly. Stop all feeding October–March. Never use high-nitrogen feeds as your only fertiliser — excess nitrogen suppresses flowering.
Cardamom Fertiliser — Key Facts from ICRI & Spices Board India
These numbers come directly from the Indian Cardamom Research Institute (ICRI) and Spices Board India — the world’s foremost authorities on Elettaria cardamomum cultivation.
+ Sep/Oct
What Each Nutrient Does for Cardamom
Understanding why cardamom needs each nutrient tells you exactly when to prioritise which fertiliser type — and why the standard “balanced NPK and nothing else” approach leaves money on the table.

Nitrogen — Cane & Leaf Growth
Nitrogen drives vegetative growth — the tall canes, large leaves and overall plant size. Young plants (years 1–2) need a nitrogen emphasis to build structure. Mature plants need moderate nitrogen, balanced with potassium. Excess nitrogen on a mature plant produces abundant leafy canes at the direct expense of flowering and pod production. Never use a high-nitrogen feed as your primary fertiliser on a plant over 2 years old.

Phosphorus — Root & Flower Structure
Phosphorus supports root development and the structural formation of flowers and pods. Commercial growing uses Single Super Phosphate (SSP) or Di-Ammonium Phosphate (DAP). An ICRI 2024 soil survey found that most cardamom-growing soils actually have high phosphorus availability — which means excess phosphorus application is wasteful and can create nutrient lockout. A balanced NPK provides adequate P without over-application.

Potassium — Pods, Oil & Disease Resistance
Potassium is cardamom’s most important macronutrient — commercial guidelines recommend double the potassium of nitrogen (150kg K vs 75kg N per hectare). Potassium drives pod formation, improves essential oil content (which determines flavour and market value), strengthens cell walls for disease resistance, and supports efficient photosynthesis. Switch to a potassium-heavy feed (tomato feed or MOP supplement) from June when panicles appear.

Magnesium — Chlorophyll & Essential Oil
Magnesium is the central atom of chlorophyll molecules — without it, photosynthesis collapses. The Spices Board India flags magnesium deficiency as widespread in cardamom soils. Beyond chlorophyll, magnesium also enhances essential oil content in pods, which directly affects flavour quality. The standard fix is Epsom salt (magnesium sulfate) — either as a monthly foliar spray or incorporated into the soil. Monthly application prevents the interveinal chlorosis that growers often misdiagnose as iron deficiency.
Complete Cardamom Fertiliser Schedule — Month by Month
This schedule applies the Spices Board India’s two-period application principle to a home-growing context — adapted for container plants and temperate climate growers.
| Month | Feed Type | Application | Why | Feed? |
|---|---|---|---|---|
| January–March | None | — | Semi-dormant period — roots cannot process nutrients | ✕ Stop |
| April | Balanced NPK (10:10:10) | Monthly liquid feed at half strength to start | Restart feeding as growth resumes — ease in gently | ✓ Start |
| May | Balanced NPK + Epsom salt foliar | Full-strength NPK liquid + Epsom spray (1 tbsp/4L) | Active growth phase — nitrogen emphasis for new canes | ✓ Active |
| June | Balanced NPK + K supplement + Epsom foliar | Balanced feed + tomato feed or potassium boost monthly | Panicle initiation — switch emphasis to potassium now | ✓ Switch |
| July–August | Potassium-rich (tomato feed) + Epsom foliar | K-rich liquid monthly + Epsom spray monthly | Flowering and pod development — peak potassium need | ✓ Peak K |
| September | Final K feed + zinc sulfate foliar | Tomato feed + zinc spray (0.25% zinc sulfate) | Late season pod fill — zinc enhances oil content per ICRI | ✓ Final |
| October | Stop all feeding | Flush soil with plain water once | Growth winding down — feeding now causes root burn | ✕ Stop |
| November–December | None | — | Dormancy period — roots inactive | ✕ None |
Cardamom Fertiliser Dose Calculator
Enter your pot size, plant age and current growth stage — get the exact liquid fertiliser dose for this month, Epsom salt quantity, and a personalised monthly schedule. Takes the guesswork out of feeding your cardamom.
🌾 Fertiliser Dose Calculator
Calculates exact monthly doses for your specific plant and pot — no guessing, no overfeeding.
Cardamom Nutrient Deficiency — Visual Guide
Each nutrient deficiency produces a distinct visual pattern on cardamom foliage. Identify what you’re seeing, then apply the targeted fix — not just “more fertiliser.”

Pale yellow-green colour spread uniformly across older lower leaves. Young leaves at the top remain greener. Slow, stunted growth. Thin, weak new canes. Common in plants that haven’t been fed for 8+ weeks in the growing season, or those potted in spent, exhausted soil.

Yellow patches develop between the leaf veins, while the veins themselves remain distinctly green — this interveinal pattern is the diagnostic signature of magnesium deficiency. The ICRI 2024 soil survey found this is the most widespread micronutrient problem in cardamom-growing areas. Also caused by overuse of high-potassium feeds which lock out magnesium uptake.

New leaves emerge unusually small and pale, with shortened internodes making the growing tips look dense and stunted. Zinc deficiency reduces essential oil content in cardamom pods — a direct quality issue. The Spices Board India recommends zinc sulfate foliar spray twice annually (April/May and September/October) as a standard preventive measure in all cardamom growing.

Paradoxically, too much fertiliser creates nutrient deficiency symptoms. Salt build-up from over-application draws water out of roots (osmotic stress), causing brown leaf tips, wilting despite moist soil, and a white crystalline crust on the soil surface. This is particularly common in winter when growers continue summer feeding rates on a semi-dormant plant.
Cardamom Deficiency Symptom Checker
Select what you’re seeing on your plant — get an instant diagnosis, the most likely deficiency or problem, and exact steps to fix it. Based on ICRI and Spices Board India diagnostic criteria.
🔍 Deficiency Symptom Checker
Describe your plant’s symptoms — get a diagnosis and targeted fix in seconds.
Organic Fertilisers for Cardamom
Cardamom is naturally grown in forest understory conditions rich in decomposing organic matter. Organic fertilising closely mimics this environment and improves long-term soil health.

Best organic options for home growers
Best Fertilisers to Buy for Cardamom
Products we recommend based on the specific nutritional needs of Elettaria cardamomum — not generic plant food suggestions.

Balanced Liquid NPK (10:10:10)
The April–May base feed. Monthly application at label rate from the restart of growth. Do not skip — this establishes the foundation for the whole season.
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High-Potassium Tomato Feed
The June–September supplement. Switch to this when panicles appear. High potassium (K) directly supports pod formation, essential oil content and disease resistance in cardamom.
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Epsom Salt (Magnesium Sulfate)
Monthly foliar spray April–September. ICRI confirmed magnesium deficiency is widespread in cardamom soils. 1 tablespoon per 4 litres — don’t mix with NPK feed in same application.
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Liquid Seaweed Extract
Monthly drench for trace minerals, cytokinins and potassium. Ideal as a gentler alternative between NPK feeds, or as a transplant/recovery tonic after repotting.
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Worm Castings (Vermicompost)
ICRI-recommended organic amendment. Top-dress monthly or incorporate into the potting mix. Almost impossible to over-apply — safe for all growth stages including seedlings.
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Neem Cake
Spices Board India-recommended amendment. Slow-release N, improves root health and suppresses soil nematodes. Mix 1 tsp into top soil monthly during the growing season.
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Cardamom Fertiliser — 20 Expert Answers
Every fertilising question cardamom growers ask — answered with specifics, not generalities. LSI keywords covered: NPK ratio, tomato feed, Epsom salt, worm castings, seaweed, liquid feed, slow release, organic, deficiency, schedule.



