Common Orchid Ailments
Even well-cared-for orchids can occasionally show signs of stress. Yellowing leaves, spotted flowers, or shriveled bulbs are often your plant’s way of telling you something is off.
Use this guide to help identify common orchid issues and what might be causing them.
Leaf Problems
Yellowing Leaves
If only older leaves on the back bulbs turn yellow, this is usually a normal aging process.
If newer leaves begin to yellow and soften, check for these possible causes:
- Too much light
- Low temperatures
- Nitrogen deficiency (especially in bark-based potting mixes)
- Loss of roots
Blackened Areas on Leaves
If brown or black patches appear suddenly on leaves during a bright, hot day, the plant may have sunburn.
What to do:
- Check that your orchid has proper shade.
- If the spots continue to grow, it may be bacterial or fungal disease.
Treatment:
- Remove the affected area
- Treat with a fungicide
- Isolate the plant
- Keep foliage dry
Shriveled Pseudobulbs
Shriveled or wrinkled pseudobulbs usually mean the plant is losing water.
Common causes include:
- Low humidity
- Underwatering or dry potting medium
- Loss of roots
Blackened Leaf Tips
Black or dying leaf tips may be caused by:
- Overfertilizing (especially common with cymbidiums)
- Excess minerals or salts in water
- Fungal leaf dieback
Solutions:
- Stop fertilizing temporarily
- Flush the pot thoroughly with clean water
- Remove affected areas and apply fungicide if needed
Brown or Black Streaking on Leaves
Streaks or mottled patterns on leaves may indicate a virus infection.
If you suspect a virus:
-
Send a leaf sample to your local agricultural extension or testing lab for confirmation.
Small Spots That Turn Black
Small reddish-brown spots that eventually turn black are usually caused by fungal infections.
These infections are often encouraged by:
- Warm temperatures
- High humidity
- Poor light or airflow
Treatment:
- Reduce humidity
- Increase air circulation
- Treat with fungicide
Flower Problems
Deformed Flowers
If your orchid produces deformed flowers every year, the issue may be genetic, and the plant may need to be discarded.
Occasional deformities may be caused by:
- High temperatures and low humidity during bud development
- Physical or chemical damage to buds
- Random developmental issues
- Possible virus infection
If a virus is suspected, isolate the plant.
Flowers Wilting Quickly
If flowers wilt soon after opening or appear to “go to sleep,” possible causes include:
- Air pollution from ethylene or other gases
- Sudden environmental changes
- Accidental pollination by insects
Spots on Flowers
Light brown or pinkish spots on flowers often indicate Botrytis fungus or sooty mold.
To prevent further spread:
- Reduce humidity
- Increase ventilation and air movement
- Remove old or spotted flowers
Punctures in Flowers
Tiny holes or punctures in flowers may indicate pests such as:
- Aphids (sap-sucking insects)
- Thrips (tiny chewing insects)
Treat with an appropriate insect control product.
Bruised Flowers
Bruising on flowers can be caused by:
- Mechanical damage (handling or bumping)
- Spider mites
Chewed Flowers, Buds or Roots
If flowers or buds appear eaten or damaged, check for:
- Slugs or snails
- Cockroaches
Use appropriate bait or pest control methods to manage these pests.
Root Problems
Loss of Roots
Root loss can be difficult to diagnose and may have several causes, including:
- Overwatering
- Black rot (caused by Pythium)
- Slugs or snails feeding on roots
- High salt content in water
- Old or broken-down potting medium
Possible solutions include:
- Repotting in fresh medium
- Treating the plant with appropriate fungicides
- Addressing watering and water quality issues