Pocket Botanist
Check these first
- Look for fuzzy or powdery growth on the spots.
- Check if the plant is crowded by other pots.
- Observe if the spots are spreading to new leaves.
Likely causes
Fungal Leaf Spot
Most likelyHow to tell: Small dark or brown spots appear on the leaves, sometimes with a yellow halo. These spots may grow larger over time.
What to do: Remove the affected leaves immediately to stop the spread. Improve airflow around the plant and avoid getting water on the leaves when you water.
Overhead Watering
PossibleHow to tell: Spots appear after you have watered the plant from above. The leaves stay wet for too long, creating a breeding ground for fungi.
What to do: Always water at the base of the plant directly onto the soil. If the leaves get wet, gently pat them dry with a paper towel.
When to worry
A few spots are manageable, but if the entire plant is covered, it can weaken the vine significantly. Remove the worst leaves to save the rest of the plant.
Stopping it coming back
Keep the foliage dry and ensure the plant has plenty of space for air to circulate.
Not sure which one it is? Photograph your sweet potato.
This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
Questions people ask
- Is this a pest problem?
- Usually not, but check the undersides of the leaves just in case. Fungal spots are distinct from the damage caused by chewing insects.
- Can I use a fungicide?
- You can, but it is better to fix the environment first by increasing airflow and reducing humidity.
More problems with Sweet Potato
Back to the Sweet Potato guide
This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.