Should I cut brown spots off my orchid leaves?

For sunburn or an old, dry, stable spot, leave the leaf alone, since a partly green leaf still feeds the plant and cutting stresses it further. For a spreading, soft, or wet-looking spot that signals bacterial or fungal infection, act fast: with a sterilized blade, cut the affected leaf back into clean, firm tissue, removing an inch or so past the visible damage, then dust the cut with cinnamon as an antifungal. If the infection has reached the crown or most of a leaf, remove the whole leaf at the base. Always sterilize the blade between cuts so you do not spread the pathogen.

What does bacterial brown spot on an orchid look like?

Bacterial brown spot, common on Phalaenopsis, starts as a small soft, water-soaked blister that quickly enlarges into a sunken brown or black spot, often with a yellow margin, and it can spread across a leaf within days and ooze fluid when pressed. It moves fast in warm, humid, still conditions and can reach the crown, where it becomes life-threatening. Isolate the plant immediately, cut the infected tissue back into clean leaf with a sterile blade, keep the foliage dry, improve airflow, and treat the cut with cinnamon or a copper-based bactericide labeled for the purpose.

Can orchids get sunburned, and what does it look like?

Yes. Orchid sunburn appears as pale tan, yellowish, or bleached patches on the leaves or leaf sections facing the light, which may later dry into dark brown or black sunken spots. Unlike infection, sunburn does not spread, is usually dry and firm, and is confined to the most exposed surfaces. Phalaenopsis and most common orchids want bright, indirect light, so move a scorched plant to an east window or a few feet back from brighter glass, or filter the light with a sheer curtain. The damaged patches will not turn green again, but new growth will emerge clean.

Why does my orchid have black spots on the leaves?

Black spots on orchid leaves usually mean a fungal or bacterial infection, cold damage, or the late stage of severe sunburn. Soft, spreading, wet-looking black spots point to infection and need immediate isolation, sterile removal of the affected tissue, and dry, airy conditions. Firm, dry black or dark brown sunken patches on sun-facing leaves point to old sunburn and will not spread. Black patches after exposure to cold, such as a chilly windowsill or a cold delivery in winter, are cold injury. Identify which by whether the spot is soft and spreading or dry and stable.

How do I stop brown spots from spreading on my orchid?

Treat spreading spots as an infection until proven otherwise. Isolate the plant from your other orchids, and with a flame- or alcohol-sterilized blade cut the affected leaf back into clean, firm tissue, an inch past the visible damage, sterilizing the blade between cuts. Dust the wound with cinnamon or apply a copper-based product labeled for orchids. Then keep the foliage dry by watering only at the roots, never into the crown, and improve airflow with spacing or a gentle fan, since still, humid air is exactly what bacterial and fungal pathogens need to advance.

Brown Spots on Orchid Leaves: Causes and Fixes

Written & researched by Elena Marsh Gardening & Landscaping Editor

Updated April 2026

Wide view of a person's hands wiping the leaves of a large indoor plant beside a bright window, in soft overcast light

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Brown spots on orchid leaves come from four main causes, and telling them apart decides whether you act in minutes or can relax: bacterial or fungal infection (soft, spreading, wet-looking spots — an emergency), sunburn (dry, firm, bleached-then-brown patches on sun-facing leaves), overwatering (yellowing with soft spots and rotting roots), and cold damage (dark patches after chilling). The single most important distinction is soft and spreading versus dry and stable: a spreading spot is likely infectious and must be cut out fast, while a stable spot is cosmetic. Read the spot first, then follow the matching path below.

We do not physically test or handle the plants and products we write about; our guidance draws on horticultural extension research and the aggregated experience recorded in thousands of owner reviews, as explained in how we rank. For the day-to-day routine, see how to care for an orchid.

Soft and spreading, or dry and stable?

Press gently on the spot and watch it over a day or two. Its texture and behavior tell you the cause.

What you see	Likely cause	Urgency
Soft, water-soaked, spreading, may ooze	Bacterial or fungal infection	Act immediately
Dry, firm, bleached then brown, sun-facing	Sunburn	Cosmetic, adjust light
Yellowing leaf, soft spots, rotting roots	Overwatering	Fix watering and roots
Dark patches after chilling	Cold damage	Move to warmth

Also check the crown, the central point where leaves meet. A soft or discolored crown means an infection has reached the growing point, which is a serious, often fatal situation that needs immediate action.

Wide environmental view of a person's hands wiping the leaves of a large indoor plant beside a bright window, in warm late-afternoon light

Bacterial and fungal infection — the emergency

The spots that demand fast action are soft, water-soaked, and spreading. Bacterial brown spot, common on Phalaenopsis, begins as a soft blister that enlarges into a sunken brown or black lesion, often ringed with yellow, and can cross a leaf in days. Fungal spots look similar but tend to be drier and slower. Both thrive in warm, humid, stagnant air. To stop the spread:

Isolate the plant from your other orchids at once.
Sterilize a blade with flame or alcohol.
Cut the affected leaf back into clean, firm tissue, removing about an inch past the visible damage, and sterilize the blade between cuts.
Dust the wound with cinnamon, a well-known horticultural antifungal, or apply a copper-based product labeled for orchids.
Keep foliage dry — water at the roots only, never into the crown — and improve airflow.

If the infection reaches the crown, prognosis is poor, so early, decisive cutting is what saves the plant.

Wide view of a person's hands wiping the leaves of a large indoor plant beside a bright window, in bright midday sun

Sunburn

Dry, firm, bleached patches on the leaves facing the light — later drying into dark brown or black sunken spots — are sunburn. Unlike infection, sunburn does not spread and stays confined to the exposed surfaces. Most common orchids, including Phalaenopsis, want bright, indirect light; direct sun through unshaded glass, particularly in summer, scorches them. Move the plant to an east-facing window, a few feet back from brighter glass, or behind a sheer curtain. The damaged tissue will not recover, but new leaves will come in clean once the light is right.

Overwatering

When brown spots come with a yellowing leaf and the roots are brown and mushy, overwatering is the driver. Waterlogged roots rot and can no longer supply the plant, and stressed, failing tissue browns. Unpot the plant, trim rotted roots back to firm tissue with sterile shears, repot into fresh bark in a well-draining pot, and water only when the roots turn silvery-gray. See why is my orchid wilting for the full root-rot recovery and how often to water an orchid for the corrected rhythm.

Golden-hour view of a person's hands wiping the leaves of a large indoor plant beside a bright window

Cold damage

Dark brown or black patches that appear after the plant was chilled — a cold winter windowsill, a draft, or a cold shipment — are cold injury. The damaged cells collapse and darken. Move the plant to a stable, warm spot, keeping it above the low 60s Fahrenheit at night and away from cold glass and drafts. Cold-damaged tissue does not recover, so trim badly affected leaves and protect the plant from chills going forward.

Preventing brown spots on orchid leaves

Water at the roots only, never into the crown, and let excess drain.
Give bright, indirect light — no scorching direct sun.
Keep airflow moving; still, humid air breeds leaf-spot pathogens.
Avoid chills — keep the plant warm and away from cold windows and drafts.
Sterilize any blade before cutting, and act fast on soft, spreading spots.

For related orchid symptoms, see why are my orchid leaves curling and why is my orchid turning yellow. Feeding is covered in our best orchid fertilizer roundup, and everything else is at the houseplants and indoor greenery hub.

Brown Spots on Orchid Leaves: What They Mean