Why does my string of hearts have brown tips?

The 3 most likely causes

The cause of string of hearts 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. Underwatering or letting it dry too long (Most likely)
   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. String of hearts prefers water thoroughly, then let the pot dry almost completely — every 2-3 weeks.
2. Sunburn or intense direct sun (Possible)
   Bleached patches, papery brown spots, or crisped leaf surfaces on the south-facing side of string of hearts are sunburn. Acclimatise it more gradually after a move, or filter midday sun with a sheer curtain. Sunburn damage doesn't heal — wait for new growth.
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.

Why string of hearts in particular

String of hearts leaves are small hearts rather than long blades, so browning shows up at the pointed tip or along the thin margins rather than as a broad crispy edge. Dry, brown edges usually mean the plant has been left thirsty too long or the air around a hanging pot is very dry and warm. Salts from hard water or feed can also scorch the delicate leaf rims. Trim spent leaves; new growth at the tips should come in clean.

Normal turnover, or real trouble?

Because the leaves are little pointed hearts rather than long blades, any browning shows at the fine tip or thin margin, not as a broad crisp edge. A single old leaf browning at its point low on a mature strand is ordinary ageing. It's worth acting on when many tips brown together, when the browning appears on fresh growth, or when whole leaf rims crisp, usually from thirst, dry warm air, or mineral scorch.

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

Even out watering first, since letting the tuber run bone-dry for too long crisps the delicate tips. If you water adequately and the air around a hanging pot is hot and dry, that's the driver, so move it off a baking windowsill. Where hard water or feed salts are scorching the rims, switch to filtered or rainwater and ease off fertiliser. Pinch away only fully spent leaves; new tips come in clean.

This is the recovery sequence Growli walks users through for string of hearts 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 string of hearts 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 string of hearts aim for water thoroughly, then let the pot dry almost completely — every 2-3 weeks, 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 string of hearts 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 string of hearts, the single biggest preventative is matching its native rhythm: water thoroughly, then let the pot dry almost completely — every 2-3 weeks, very bright light with some gentle 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 string of hearts toxic to cats and dogs? — pet-safe, per the ASPCA
• How often to water string of hearts — the watering brief
• When to repot string of hearts — 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
• String of hearts — yellow leaves
• String of hearts — curling leaves
• String of hearts — drooping
• Monstera — brown leaf tips