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How To Treat Dark Spots On Orchid Leaves

Orchids are plants that hardly get sick. But when they do get sick, the most common disorder is the brown spots on the leaves.

What causes the brown spots?

Most commonly, the brown spots occur after pathogenic mold infection (fungi).
Sometimes, these brown spots are caused by bacteria.

The infection causes are diverse, but these are the most common ones:

A latent infection that is triggered when the plant receives improper living conditions (excessive humidity, lack of humidity etc.);
Contact with other infected plants;
Infection caused in situations where plant suffers damage during repotting process or because of accidental injuries.

Where these spots occur?

These brown spots (sometimes black) can occur on all plant organs: roots, leaves and flowers.

How to prevent the infection?

By providing minimum conditions required by the orchids;
By keeping the orchid in a healthy state;
By proper fertilization.

How to treat diseased orchids?

Plants showing signs of disease are isolated from the healthy ones.
If the illness is in an early stage, the removal of infected parts is recommended, whether it’s the flowers, leaves or roots.
If the disease tends to expand to the whole plant, it requires quick intervention, ie: changing the pot and the substrate, removing affected parties, sinking the roots in a fungicide solution and spraying the rest of the plant with the same solution.

Instead of fungicide you can also use a solution made of 4-5 crushed garlic cloves, over which you poured 1 liter of boiling water. After cooling, filter the solution and use it in the same manner as described above.
In serious cases, you have to remove the floral stem, especially if it has been aesthetically compromised.
The rescue action should particularly target the bud (the area where the new leaves appear).
In some situations, you must get rid of the plant.


Working with fungicides requires attention, because they are highly toxic substances!
Follow the instructions for preparing the solution.
Since these treatments are homemade, it is advisable to apply them in the bathtub.
Thoroughly wash the tub after the operation.

Image Credits: Orchid Geeks

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