Troubleshooting
Peruvian bougainvillea problems — and how to fix them
Peruvian bougainvillea (Bougainvillea peruviana) 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.
Failure to bloom
Caused by excess nitrogen, too much water, or insufficient light. Induce flowering by withholding water until leaves just begin to wilt (3–4 week dry period), ensuring full sun, and switching to a high-potash feed.
Root rot (Phytophthora / Pythium)
Overly wet or poorly drained soil quickly leads to root and stem rot, visible as wilting despite moist soil and blackened stem bases. Improve drainage immediately, reduce watering, and treat with a fungicide drench if caught early.
Bougainvillea looper caterpillar
Larvae of the moth Disclisioprocta stellata skeletonise leaves rapidly. Hand-pick egg masses and caterpillars; apply Bacillus thuringiensis (Bt) spray at first sign of damage. Severe infestations can be treated with a registered insecticide.
Prevent peruvian bougainvillea problems before they start
Most peruvian bougainvillea issues are care-mismatch, not bad luck. Dial in the basics:
Looking for peruvian bougainvillea in general rather than its problems? Read the full peruvian bougainvillea care guide — light, water, soil and feeding.
Peruvian bougainvillea problems — FAQ
Why is my peruvian bougainvillea failure to bloom?
Caused by excess nitrogen, too much water, or insufficient light. Induce flowering by withholding water until leaves just begin to wilt (3–4 week dry period), ensuring full sun, and switching to a high-potash feed.
Why is my peruvian bougainvillea root rot (phytophthora / pythium)?
Overly wet or poorly drained soil quickly leads to root and stem rot, visible as wilting despite moist soil and blackened stem bases. Improve drainage immediately, reduce watering, and treat with a fungicide drench if caught early.
Why is my peruvian bougainvillea bougainvillea looper caterpillar?
Larvae of the moth Disclisioprocta stellata skeletonise leaves rapidly. Hand-pick egg masses and caterpillars; apply Bacillus thuringiensis (Bt) spray at first sign of damage. Severe infestations can be treated with a registered insecticide.