Plant care guide
Calathea Brown Tips: Will a Humidity Tray Fix Crispy Edges?
Updated
Why does my Calathea have brown tips?
Crispy brown tips and edges on a calathea are usually a dry-air problem, which a pebble tray or humidifier can help. If new leaves still crisp once the air near the plant is humid, look at how far the mix dries between waterings, then at salts and tap water.
What to do first
Put a hygrometer beside the leaves. If the reading is low, set up a pebble tray with the pot above the water line, group plants or run a humidifier. If humidity is fine, check the mix, flush salts and review your water.
Crispy brown tips on a calathea are frustrating, because the plant is grown for its leaves. Dry air is the first suspect, and a humidity tray can help. It only fixes the problem if humidity was the cause and the tray is set up properly.
Most plants sold as calathea are now Goeppertia. The brown tissue already there will not turn green again. Judge any fix on the next leaves.
Why Dry Air Comes First
The RHS calathea guide says browning leaf tips are usually a result of low humidity. NC State Extension says browning or curling of the leaf edges and tips on the rattlesnake plant, Goeppertia insignis, can result from low humidity.
The gap between what calatheas want and what homes provide is large:
| Figure | Source |
|---|---|
| At least 60% humidity for G. orbifolia | NC State |
| 40–60% to keep calatheas looking good indoors | UF/IFAS |
| 10–20% in many homes in winter | Iowa State |
Browning that starts when the heating comes on, on a plant whose mix stays evenly moist, fits dry air.
Setting Up a Humidity Tray That Works
Iowa State Extension describes the method. Fill a tray or saucer with pea gravel or pebbles and add water. Keep the bottom of the pot above the water line. Water evaporating from the tray raises humidity around the plant.
Get the details right:
- Keep the plant over the tray. Maryland describes the tray as raising humidity in the area around the plants, not the whole room.
- Keep the pot base dry. NC State’s rattlesnake plant profile suggests standing the pot in a bed of wet pebbles, not in water. Roots sitting in water can rot; the calathea drooping guide covers the root check.
- Top up the water as it evaporates, so the pebbles stay wet.
- Group plants. Iowa State and University of Maryland Extension both note that grouped plants raise humidity around themselves.
- Skip misting. Iowa State calls misting ineffective, because foliage dries quickly. Maryland says it is questionable whether misting raises humidity at all.
Check Whether the Tray Is Enough
Place a hygrometer right beside the leaves, not across the room, and read it for a few days. If the reading stays low, add a humidifier. Iowa State calls humidifiers an excellent way to raise humidity, and NC State lists a humidifier or wet pebble tray for G. orbifolia.
The RHS also suggests moving calatheas into a bathroom, where there is plenty of water vapour. Keep the light bright and indirect. Maryland advises keeping plants away from heating and air-conditioning sources, which dry the air at the leaves.
When Humidity Is Not the Cause
If the air reads humid and new leaves still crisp, work through the other causes Iowa State names.
Dry mix between waterings. Iowa State says letting plants dry out too long browns tips and edges. NC State asks for mix that stays moist, but not wet, in spring and summer. Check the mix with a finger before it dries hard.
Fertilizer salts. University of Maryland Extension’s salts page lists browning of leaf tips and margins and a white crust on the mix. Flush the pot with clear water, letting it drain, and repeat with a volume at least that of the pot. UF/IFAS links leaf margin and tip necrosis in calatheas to excess fertilizer.
Tap water. Iowa State lists calathea among species sensitive to chlorine and fluoride over time. Our calathea water quality guide explains how to test that one change at a time.
Sun or heat. Brown patches in the middle of the leaf, on the window side, point to scorch. See the calathea sunburn guide.
Trimming and Judging Progress
Trim crisp tips with clean scissors, following the leaf’s outline and leaving a thin brown edge. Iowa State says trimming improves appearance, but new browning will occur if the cause is not fixed.
Change one thing at a time and give it a few new leaves. Our rattlesnake plant brown edges article works through every cause in more depth. For curling alongside the browning, see the calathea curling leaves guide, and the calathea hub lists our other guides.
References
- RHS: How to grow calatheas
- NC State Extension Gardener Plant Toolbox: Goeppertia insignis
- NC State Extension Gardener Plant Toolbox: Goeppertia orbifolia
- UF/IFAS Extension: Cultural Guidelines for Commercial Production of Interiorscape Calathea (EP285)
- Iowa State University Extension: How can I raise the relative humidity indoors for my houseplants?
- Iowa State University Extension: Why does my houseplant have brown leaf tips and edges?
- University of Maryland Extension: Temperature and humidity for indoor plants
- University of Maryland Extension: Fertilizer toxicity or high soluble salts on indoor plants
How this guide was put together: RHS, NC State Extension, UF/IFAS Extension, Iowa State University Extension and University of Maryland Extension guidance.