Why does my begonia have brown tips?

The 4 most likely causes

The cause of begonia 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. Low humidity (Likely)
   Begonia 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.
2. Fluoride or chlorine in tap water (Likely)
   Begonia 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.
3. Underwatering or letting it dry too long (Possible)
   Underwatering looks similar to overwatering at first — both produce limp, dull leaves — but the soil tells the truth. If the soil is dust-dry several centimetres down, water deeply. Begonia prefers when the top 2-3cm of soil is dry, every 5-7 days.
4. 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.

Why begonia in particular

Those thin, decorative leaves transpire freely and pull minerals out to their margins, so a Rex begonia is quick to show crispy brown tips and edges when the air is dry or the water is hard. Salts concentrate at the leaf rim as moisture evaporates and scorch it, while dry indoor heating finishes the job. The tell is browning confined to the outermost edge with healthy colour behind it — a moisture-and-mineral signal, not the whole-leaf yellowing of a root problem.

Normal turnover, or real trouble?

A Rex's leaf edge is often naturally toothed and rimmed in red or fine hair, so a thread-thin darkening right at the margin can be the leaf's own colouring rather than damage, and the oldest, lowest leaves crisp at the very tip first as they are quietly retired. That much is cosmetic. It becomes a real signal when the browning is wide, advancing inward, and appearing across many leaves of every age at once.

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

Two moves come first. Leach the pot: water it slowly and heavily with rainwater or filtered water until plenty runs from the base, then do it again, to wash out the mineral salts collecting at the roots and leaf edges. Then switch permanently off hard tap water onto rainwater or filtered, and lift the humidity around the plant. If you tidy the brown tips, cut just inside them and never back into green tissue.

This is the recovery sequence Growli walks users through for begonia 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 begonia 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 begonia aim for when the top 2-3cm of soil is dry, every 5-7 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 begonia 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 begonia, the single biggest preventative is matching its native rhythm: when the top 2-3cm of soil is dry, every 5-7 days, bright indirect light, 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 begonia toxic to cats and dogs? — toxic to pets, per the ASPCA
• How often to water begonia — the watering brief
• When to repot begonia — 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
• Begonia — yellow leaves
• Begonia — curling leaves
• Begonia — drooping
• Monstera — brown leaf tips