Struggling oleander owner? "My oleander is sick all the time. It has blackish tumors on the twigs and leaves. The leaves fall and the branches dry up. I have a black oleander!"
As experienced horticulturists, we recognize this as bacterial blight (a bacterial disease) on your oleander. Once established, treatment is limited and often spread by aphids or other biting insects. Prune branches 10 cm below affected areas; severe cases may require flush cuts. Regrettably, it recurs in roughly half of instances. Oleanders flourish in warm, humid conditions.
Oleanders need consistent humidity without waterlogging. Opt for sunny spots with well-draining soil, ample spring watering, and moderate summer applications during bloom—avoid excess.
Bordeaux mixture sprays, horsetail, and nettle manure provide effective prevention.
Boosting soil with organic matter, compost, and fertilizers improves structure, making plants more resistant to bacterial blight and similar issues.
Critical: Disinfect pruning tools between every shrub to halt spread.
