Lemongrass Brown Leaf Tips: Causes and How to Fix It
Browning, crispy blade tips are the most common lemongrass complaint — and inconsistent moisture is behind most of them. Here are the likely causes, ranked, with how to tell them apart and fix each one.
Underwatering or soil drying out (the usual culprit)
What's happening
Lemongrass is a thirsty streambank grass that hates drying out. When the soil goes too dry, the plant can't keep its long blades hydrated to the ends, so the tips brown and crisp first while the rest stays green.
How to confirm
The soil feels dry well below the surface, a potted plant feels light, and the browning is worst on the longest, most exposed blades. Blades may also curl inward along their length.
How to fix it
Water thoroughly until it runs from the drainage holes, and in summer heat check daily — potted lemongrass often needs water every day. Trim the browned tips at an angle for a tidy look; the cut won't regreen but new growth will be clean.
Prevent it
Keep the soil consistently moist, mulch outdoor clumps to hold water, and never let a potted plant dry to the point of wilting.
Dry air or hot wind
What's happening
As a humidity-loving tropical, lemongrass scorches at the tips when the air is very dry or it's battered by hot, drying wind — common indoors near heating vents or outdoors in arid climates.
How to confirm
Tips brown despite moist soil, the air in the room or region is dry, and the plant sits near a vent, fan, or in an exposed windy spot.
How to fix it
Raise humidity by grouping pots, setting the pot on a pebble tray, or misting on hot afternoons. Move an indoor plant away from heating vents and a potted outdoor plant out of relentless wind.
Prevent it
Give it moderate to high humidity, shelter it from drying wind, and keep it clear of forced-air vents indoors.
Fertilizer or salt build-up
What's happening
Too much fertilizer, or mineral salts from hard tap water, accumulate in the soil and burn the root tips, which shows up as browned, scorched-looking blade tips.
How to confirm
You've been feeding heavily or frequently, there may be a white crust on the soil surface or pot rim, and the browning isn't explained by dry soil or dry air.
How to fix it
Flush the pot with plain water several times to leach out excess salts, let it drain fully, and hold off feeding for a few weeks. Resume at a lighter rate once new growth looks clean.
Prevent it
Feed at the recommended strength every 2–4 weeks in the growing season only, and flush container plants with plain water occasionally.
When to worry (and when not to)
A little tip browning on the oldest outer blades is cosmetic and normal on a fast-growing grass — just trim it off. Worry when browning spreads quickly down whole blades, when most of the clump crisps at once, or when it pairs with collapse and soggy soil. Caught early, a lemongrass with browning tips greens up its new growth fast once watering and humidity steady out.