Tradescantia zebrina
Quick answer
Brown, crispy tips on your inch plant have a few possible causes, and on this plant the likeliest is dry air. The full list is below.
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How to tell
Just the very tips and edges go brown and papery while the rest of the leaf is fine. This is most common in winter with the heating on, and inch plant prefers 50–70% humidity.
The fix
Raise humidity: group plants together, sit the pot on a tray of damp pebbles, or run a humidifier. Misting helps only briefly.
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How to tell
The soil dries out hard between waterings, so the tips (the last to get water) crisp first.
The fix
Water more evenly: check the soil regularly and don’t let it go completely bone dry, then soak thoroughly.
How to tell
Tips brown slowly over months despite even watering, and a white crust builds up on the soil surface or the pot rim. Hard water or fertilizer salts can leave this crust. It does not identify fluoride injury.
The fix
Switch to rainwater or distilled water, and flush the pot occasionally to wash out built-up salts.
How to tell
Tips brown within a week or two of feeding, sometimes with a white crust on the soil surface or the pot rim. It follows feeding too often or too strong.
The fix
Flush thoroughly with plain water and feed less often, always diluted.
How to tell
Dry brown patches or scorched edges show up where strong sun hits the leaf. Inch plant wants bright, indirect light.
The fix
Move it back from the glass, or filter the strongest sun with a sheer curtain.
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