Fertilising guide
How to fertilise East Indian Lemongrass (Cymbopogon flexuosus)— schedule & NPK
Also called Cochin Grass, Malabar Grass.
More about east indian lemongrass
About East Indian Lemongrass
Cymbopogon flexuosus · also called Cochin Grass, Malabar Grass · herb
East Indian Lemongrass is a tall, clumping tropical grass grown for its strongly lemon-scented stems and the citral-rich essential oil distilled from its leaves. It demands full sun, steady warmth, and rich moist soil, growing fast into an arching fountain. Frost-tender, it is best treated as an annual or overwintered indoors in cool climates.
Growth habit: Dense, tufted perennial grass forming an upright then arching clump of slender blue-green leaves. Spreads slowly outward by tillering at the base; rarely flowers in cultivation outside the tropics.
Watch for — Thin, floppy clumps: Insufficient light or nutrients makes stems weak and pale. Move to full sun and feed regularly; cut back leggy growth to encourage a denser base.
What fertiliser east indian lemongrass actually wants — and why
East Indian Lemongrass 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 east indian lemongrass: 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 east indian lemongrass, 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 east indian lemongrass:
A hungry grass that rewards regular feeding. Apply a nitrogen-leaning or balanced fertiliser monthly through the growing season, or top-dress with compost, to drive lush leafy growth. Ease off entirely in winter while the plant is dormant or semi-dormant indoors. 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 east indian lemongrass 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 east indian lemongrass
Half strength is a sensible default for east indian lemongrass — 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 east indian lemongrass first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the east indian lemongrass watering schedule.
Signs you are over-feeding east indian lemongrass
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for east indian lemongrass:
- 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 east indian lemongrass
- 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 east indian lemongrass care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Pot-grown east indian lemongrass 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 east indian lemongrass
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 east indian lemongrass — frequently asked questions
What fertiliser does east indian lemongrass 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. East Indian Lemongrass 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 east indian lemongrass?
A hungry grass that rewards regular feeding. Apply a nitrogen-leaning or balanced fertiliser monthly through the growing season, or top-dress with compost, to drive lush leafy growth. Ease off entirely in winter while the plant is dormant or semi-dormant indoors. A hungry grass that rewards regular feeding. Apply a nitrogen-leaning or balanced fertiliser monthly through the growing season, or top-dress with compost, to drive lush leafy growth. Ease off entirely in winter while the plant is dormant or semi-dormant indoors. 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 east indian lemongrass?
Half strength is a sensible default for east indian lemongrass — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.
What does over-feeding east indian lemongrass 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 east indian lemongrass 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 east indian lemongrass?
Pot-grown east indian lemongrass 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
- East Indian Lemongrass care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water east indian lemongrass — 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 basil
- How to fertilise herb garden
- How to fertilise mint
- All 1284 fertilising guides in the Growli library