Mature size & growth rate

How big does East Indian Lemongrass (Cymbopogon flexuosus) get?

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.

Mature size: Around 1-1.8 m tall and 0.6-1.2 m wide in a single season in warm conditions.

Watch for — Frost damage: Any frost blackens and kills top growth; the crown rarely survives a hard freeze. Move pots indoors or mulch heavily before the first cold snap in marginal climates.

Indoor size vs how big it gets in the wild

East Indian Lemongrass reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back. Indoors and in a pot, expect around 1-1.8 m tall and 0.6-1.2 m wide in a single season in warm conditions.. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Growth rate and years to mature

East Indian Lemongrass is a moderate grower. Realistically, expect a single growing season — it reaches full size in one year, then is done. Its feeding profile backs this up: 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.

Want this turned into the right next pot at the right moment? The pot size calculator and the east indian lemongrass repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast east indian lemongrass grows.

How to keep east indian lemongrass smaller

You are not stuck with the maximum size. For east indian lemongrass specifically, these are the levers, in order of impact:

Choose a compact or dwarf variety of east indian lemongrass from the start — that is the most reliable size control for an annual.
Grow it in a smaller container to naturally limit how large it gets.
For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier.
Sow a little later or space plants closer if you specifically want smaller individual plants.

How to grow east indian lemongrass bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for east indian lemongrass the accelerators are:

Full sun, warm soil and steady water are what drive a crop to full size fastest.
Sow at the right time for your zone so it gets the whole season to size up.
Feed appropriately for the crop and never let it check (stall) from drought or cold.

Light is almost always the ceiling. The east indian lemongrass light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When east indian lemongrass outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for east indian lemongrass:

It sprawls beyond its bed or container before harvest — usually a spacing or support issue.
It flops or needs staking once it hits full height.
Once it has fruited or bolted, it is at its final size for good — the next plant is a new sowing.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the east indian lemongrass repotting guide. If you want more of this plant instead of a bigger one, the east indian lemongrass propagation guide turns prunings into new plants.

East Indian Lemongrass size — frequently asked questions

How big does east indian lemongrass get?

East Indian Lemongrass reaches around 1-1.8 m tall and 0.6-1.2 m wide in a single season in warm conditions. when grown indoors. It sizes up fast and once, racing from seedling to full size in a single season; after cropping it is finished, so size is a within-season question.

Is east indian lemongrass slow or fast growing?

East Indian Lemongrass is a moderate grower. Expect a single growing season — it reaches full size in one year, then is done. East Indian Lemongrass reaches its full size within one growing season — there is no "long-term" size, just how big it gets before you harvest or it dies back.

How long does east indian lemongrass take to reach full size?

Roughly a single growing season — it reaches full size in one year, then is done. Light, pot size and feeding move that timeline more than anything else.

How do I keep east indian lemongrass smaller?

Choose a compact or dwarf variety of east indian lemongrass from the start — that is the most reliable size control for an annual. Grow it in a smaller container to naturally limit how large it gets. For some crops, pinching or pruning the growing tips keeps the plant shorter and bushier. Sow a little later or space plants closer if you specifically want smaller individual plants.

How can I make east indian lemongrass grow bigger or faster?

Full sun, warm soil and steady water are what drive a crop to full size fastest. Sow at the right time for your zone so it gets the whole season to size up. Feed appropriately for the crop and never let it check (stall) from drought or cold.