Troubleshooting
African Blue Basil problems — and how to fix them
African Blue Basil (Ocimum kilimandscharicum × basilicum 'Dark Opal') 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.
Frost kill
Has no cold hardiness and dies at frost. Take cuttings or pot it up and bring indoors before the first frost to keep the perennial going.
Sprawling, woody growth
Large plants flop and go woody at the base. Pinch hard and prune regularly to keep a dense, leafy shape.
Camphor-heavy flavour
Stronger and more medicinal than sweet basil; use younger leaves for milder flavour, as mature leaves can taste harsh raw.
Whitefly and aphids indoors
Common when overwintered inside; inspect undersides, rinse pests off, and treat with insecticidal soap as needed.
Prevent african blue basil problems before they start
Most african blue basil issues are care-mismatch, not bad luck. Dial in the basics:
Looking for african blue basil in general rather than its problems? Read the full african blue basil care guide — light, water, soil and feeding.
African Blue Basil problems — FAQ
Why is my african blue basil frost kill?
Has no cold hardiness and dies at frost. Take cuttings or pot it up and bring indoors before the first frost to keep the perennial going.
Why is my african blue basil sprawling, woody growth?
Large plants flop and go woody at the base. Pinch hard and prune regularly to keep a dense, leafy shape.
Why is my african blue basil camphor-heavy flavour?
Stronger and more medicinal than sweet basil; use younger leaves for milder flavour, as mature leaves can taste harsh raw.
Why is my african blue basil whitefly and aphids indoors?
Common when overwintered inside; inspect undersides, rinse pests off, and treat with insecticidal soap as needed.