Troubleshooting
String of Watermelons problems — and how to fix them
String of Watermelons (Senecio herreianus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Root and stem rot
Overwatering is the leading cause of death. The bead-like leaves will shrivel and fall, then stems turn brown and mushy. Remove from pot, cut away rotten roots, allow to dry, and repot into fresh dry mix.
Shrivelling beads despite moist soil
Paradoxically, root rot can cause the plant to look dehydrated as roots can no longer take up water. Check roots before watering. Healthy shrivelling in summer signals normal dormancy.
Mealybugs in stem nodes
White cottony clusters appear where leaves meet stems. Remove with a cotton swab dipped in rubbing alcohol, or treat with diluted neem oil spray. Repeat weekly until resolved.
Prevent string of watermelons problems before they start
Most string of watermelons issues are care-mismatch, not bad luck. Dial in the basics:
Looking for string of watermelons in general rather than its problems? Read the full string of watermelons care guide — light, water, soil and feeding.
String of Watermelons problems — FAQ
Why is my string of watermelons root and stem rot?
Overwatering is the leading cause of death. The bead-like leaves will shrivel and fall, then stems turn brown and mushy. Remove from pot, cut away rotten roots, allow to dry, and repot into fresh dry mix.
Why is my string of watermelons shrivelling beads despite moist soil?
Paradoxically, root rot can cause the plant to look dehydrated as roots can no longer take up water. Check roots before watering. Healthy shrivelling in summer signals normal dormancy.
Why is my string of watermelons mealybugs in stem nodes?
White cottony clusters appear where leaves meet stems. Remove with a cotton swab dipped in rubbing alcohol, or treat with diluted neem oil spray. Repeat weekly until resolved.