Why does my calathea have brown tips?

The 4 most likely causes

The cause of calathea brown leaf tips usually narrows to one of the items below, ranked by how often we see each in Growli's diagnostic chats. Work down the list — most readers find their answer in the top two.

1. Fluoride or chlorine in tap water (Likely)
   Calathea is sensitive to the fluoride and chlorine added to most municipal water supplies. Minerals build up at the leaf tips and cause crispy brown edges or speckled spots. Switch to rainwater, filtered water, or tap water that has sat uncovered for 24 hours so the chlorine can off-gas.
2. Low humidity (Likely)
   Calathea is native to humid environments and struggles when household humidity drops below 40%. The first sign is crispy brown leaf tips, followed by pale, curling foliage. A humidifier, a pebble tray, or grouping plants together raises local humidity meaningfully.
3. Fertiliser salt buildup in the soil (Likely)
   Months of feeding leave mineral salts behind in the potting mix. The salts pull water away from the finest root tips, and the damage shows up at the far end of the water pipeline — the leaf tips — as crisp brown edges that keep creeping. Flush the pot with plain water until it runs freely from the drainage hole, two or three times in a row, every couple of months during the feeding season.
4. Underwatering or letting it dry too long (Possible)
   Calathea is a thirsty plant that wilts dramatically when it dries out. If the leaves are limp and the soil pulls away from the pot edge, it has gone too long between waterings. Soak the rootball thoroughly until water runs out the drainage hole.

Why calathea in particular

Crispy brown tips are the classic Calathea complaint, and this genus earns its reputation. Marantaceae are unusually sensitive to fluoride and dissolved salts in tap water; those minerals travel to the leaf margins and accumulate at the very tips, killing that tissue in a thin brown rim. Low humidity compounds it, because the thin leaves lose moisture at the edges faster than the roots replace it. Letting water sit out overnight removes chlorine but not fluoride, so the tips keep browning.

Normal turnover, or real trouble?

A fine crisp rim on one or two of the older leaves is almost part of owning this genus, which is unusually touchy about the minerals in tap water, and such a thin edge stays put and spreads no further. That much is cosmetic. The alarm is tips browning quickly on the newer leaves too, or the margins dying inward in a widening band, which signals salts and dryness building together.

How to diagnose in 60 seconds

Run these quick checks before you change anything — the right fix depends on what you find.

• Is the browning confined to the very tips and edges, or spreading inward in patches? Tips-and-edges = moisture/air/minerals; spreading patches = disease or rot.
• What water do you use? Straight tap water in a hard-water or fluoridated area is the most common brown-tip culprit for sensitive species.
• Check humidity with a cheap digital hygrometer near the plant. Below 40% is brown-tip territory for tropical foliage.
• Look for a white crust on the soil surface or the pot rim — that is fertiliser salt buildup, and the tips are where it bites.

The fix — step by step

Flush the pot before anything else: run tepid rainwater or distilled water through the soil several times to leach out the fluoride and fertiliser salts collecting at the roots, then switch off hard tap water for good. Trim the dead rim following the leaf's natural outline, leaving a hair of brown so you do not reopen the living tissue. Hold off feeding until you have flushed, since fertiliser only adds to the load.

This is the recovery sequence Growli walks users through for calathea with brown leaf tips. Work through the steps in order; skipping ahead is the most common reason a plant fails to bounce back.

1. Flush the salts out of the pot. Take calathea to the sink and run room-temperature water through the pot until it flows freely from the drainage hole — then do it twice more. This washes out accumulated fertiliser and tap-water minerals, the most common tip-burn driver.
2. Fix the water itself. Switch to filtered water, rainwater, or tap water left uncovered for 24 hours so chlorine can off-gas. For fluoride-sensitive species this single change stops new tips browning within a leaf generation.
3. Raise the humidity around the plant. Aim for 45-55% relative humidity: a small humidifier, a pebble tray under the pot, or grouping plants together all work. Misting alone doesn't — it raises humidity for minutes, not hours.
4. Reset a steady watering rhythm. Tip burn loves a feast-famine cycle. For calathea aim for when the top 1-2cm of soil is just dry, every 4-7 days, checked with a finger 3-4cm down — never a fixed calendar day.
5. Trim the brown tips cleanly (optional). Brown tissue never re-greens. For looks, trim the dead tip with clean scissors following the leaf's natural shape, leaving a hair-thin line of brown — cutting into live green tissue just restarts the browning.

When this can't be saved

Most cases of calathea brown leaf tips are recoverable, but a few red flags point to a plant that has gone past the point of return. If you spot any of these, consider propagating a clean cutting and starting over.

• The browning is marching inward past a third of the leaf on most leaves within days — that is active tissue death, not cosmetic tip burn.
• Brown tips are paired with a soft, darkening stem base — the real problem is rot below the soil, not the air above it.
• A thick salt crust keeps returning days after a full flush — the mix is saturated with minerals and needs replacing, not rinsing.

Prevention

For calathea, the single biggest preventative is matching its native rhythm: when the top 1-2cm of soil is just dry, every 4-7 days, medium indirect light, never direct sun, and a free-draining pot with a working drainage hole. Water with filtered, rain, or overnight-rested water if your tap is hard or fluoridated, keep a hygrometer near the plant and hold humidity above 45%, and flush the pot through with plain water every couple of months during the feeding season so salts never accumulate to burning levels.

Common questions

Related guides

• What's wrong with my plant? — the diagnosis apps compared
• Is calathea toxic to cats and dogs? — pet-safe, per the ASPCA
• How often to water calathea — the watering brief
• When to repot calathea — pot size and timing
• Brown leaf tips on plants — the full diagnostic guide across species
• What's wrong with my plant? — Growli's flagship diagnosis index
• Calathea — yellow leaves
• Calathea — curling leaves
• Calathea — drooping
• Monstera — brown leaf tips