Begonia leaves turning brown and crispy at edges

What it is

Leaf-edge scorch is damage in which tissue along a leaf’s margins dries out and dies. Dry air can make leaves lose water faster than roots can replace it; this kind of environmental injury is not itself an infectious disease. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))

Also called: Brown leaf margins, Leaf-edge browning

Plants affected: Indoor begonias, including rex, rhizomatous and cane types. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))

Symptoms

• Brown, dry, brittle tips or margins rather than soft, rotten patches. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))
• Wilting or dropped flower buds may accompany water stress. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))

Causes

• Low humidity, especially in heated homes during winter. ([homegarden.cahnr.uconn.edu](https://homegarden.cahnr.uconn.edu/factsheets/rex-begonia/))
• Potting mix drying too much between waterings. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))
• Direct sun or excessive heat scorching the foliage. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))
• Excess fertilizer salts building up in the potting mix. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))

How to tell it apart

Check the potting mix before adding water: crispy margins with dry mix suggest underwatering; similar margins despite suitable moisture make dry air worth checking. These are clues, not proof—begonias can also develop brown margins from bacterial disease, especially when dark, greasy-looking spots or brown V-shaped patches appear. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))

Overwatering or root rot

Wet mix, rotten leaves and leaf drop point away from simple dryness; adding more water can worsen root rot. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))

Bacterial leaf spot

Look for dark, greasy-looking spots or brown V-shaped dead areas at the margins, sometimes surrounded by yellowing tissue. ([greenhouse.cornell.edu](https://greenhouse.cornell.edu/pests-diseases/diseases-of-specific-crops/begonia/?utm_source=openai))

Powdery mildew

Fuzzy white patches on leaves or flowers distinguish it from dry-air damage. ([greenhouse.cornell.edu](https://greenhouse.cornell.edu/pests-diseases/diseases-of-specific-crops/begonia/?utm_source=openai))

Sun scorch

Direct sun exposure and bleached or damaged areas suggest excessive light rather than humidity alone. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))

Treatment

1. 1. Check moisture before watering This week, check the mix daily rather than watering automatically. For rex begonias, water when the top inch feels dry; keep other indoor types moist but well-drained, not completely dried out. When needed, water until it drains from the bottom, then empty collected water within 30–45 minutes. If the mix is wet, wait and check again. ([homegarden.cahnr.uconn.edu](https://homegarden.cahnr.uconn.edu/factsheets/rex-begonia/))
2. 2. Improve humidity without wetting leaves Today, group the begonia with other healthy houseplants or move it to a brightly lit bathroom. Keep leaves and the crown dry, with ventilation around the plant. Avoid repeated misting as a fix: it raises humidity only briefly and can encourage disease. ([homegarden.cahnr.uconn.edu](https://homegarden.cahnr.uconn.edu/factsheets/rex-begonia/))
3. 3. Remove harsh sun and hot drafts Move the plant out of direct sun and away from heating vents now. For a rex begonia beside a south- or west-facing window, try a position a few feet back, checking that sunlight no longer strikes its leaves. ([homegarden.cahnr.uconn.edu](https://homegarden.cahnr.uconn.edu/factsheets/rex-begonia/))
4. 4. Pause extra feeding Skip fertilizer this week if you have been feeding heavily; more fertilizer can worsen salt damage. At the next needed watering, water thoroughly and let runoff escape rather than collecting beneath the pot. Do not repeatedly flush already-wet mix. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))
5. 5. Tidy only after correcting care If the brown edges bother you, trim the dead portions with scissors this week. Trimming improves appearance but will not stop new browning unless the underlying cause is corrected. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))

Prevention

• Check moisture regularly, but let the mix—not the calendar—decide when to water. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/how-to/how-care-houseplants))
• Keep begonias in bright, filtered light with humidity and ventilation; avoid wetting rex leaves and crowns. ([rhs.org.uk](https://www.rhs.org.uk/plants/begonias/houseplants))
• Feed only during active growth and follow the product’s directions; excess fertilizer can brown leaf tips. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/how-to/how-care-houseplants))

When to worry

Seek a diagnosis from your local extension service if greasy spots, V-shaped lesions, soft brown rot or plant collapse appear: these can indicate disease rather than ordinary dry-edge damage. Photograph both leaf surfaces and describe your watering routine before choosing a treatment. ([greenhouse.cornell.edu](https://greenhouse.cornell.edu/pests-diseases/diseases-of-specific-crops/begonia/?utm_source=openai))

Safety

Begonias are toxic to cats and dogs; underground parts are the most toxic. If a pet chews or eats the plant, contact a veterinarian or ASPCA Poison Control at 888-426-4435 promptly; a consultation fee may apply. Keep the plant and trimmings out of reach. No treatment chemical is needed for the care adjustments above. If you later use fertilizer, follow its label for handling, protective equipment and storage, and keep it secured away from children and pets. ([aspca.org](https://www.aspca.org/pet-care/aspca-poison-control/toxic-and-non-toxic-plants/begonia))

Sharing your home with pets or small children? See which plants our sources call safe for cats, dogs and kids.

FAQ

Will the brown edges turn green again?

No. Trimming can improve their appearance, but correcting care is what prevents further browning. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))

Should I water more often?

Only if the mix is drying too much. Wet mix needs time to dry, not another watering. ([homegarden.cahnr.uconn.edu](https://homegarden.cahnr.uconn.edu/factsheets/rex-begonia/))

Should I mist my begonia?

Not as the main humidity fix. Misting has only a brief effect, and RHS advises against misting begonias because damp conditions can encourage mildew. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/how-to/how-care-houseplants))

Could fertilizer be causing this?

Yes. Excess fertilizer salts can cause brown tips and edges, so avoid adding extra feed to a stressed plant. ([yardandgarden.extension.iastate.edu](https://yardandgarden.extension.iastate.edu/faq/why-does-my-houseplant-have-brown-leaf-tips-and-edges))

Sources

• Rex Begonia — University of Connecticut
• Begonias: houseplants — Royal Horticultural Society
• Why does my houseplant have brown leaf tips and edges? — Iowa State University Extension
• How to Care for Houseplants — Iowa State University Extension
• Begonia — Cornell University Greenhouse Horticulture
• Toxic and Non-toxic Plants: Begonia — ASPCA
• Begonia | Greenhouse Horticulture