Troubleshooting
Smooth Spiral Ginger problems — and how to fix them
Smooth Spiral Ginger (Costus laevis) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Thrips on flowers and bracts
Thrips are attracted to the flowers and soft bracts, causing silvery streaking and distorted inflorescences; treat with spinosad-based insecticide or insecticidal soap and avoid overhead watering which spreads the pest.
Root rot from overwatering or poor drainage
The smooth-stemmed species is somewhat more sensitive to waterlogging than rougher-leaved Costus; ensure containers have excellent drainage and never allow pots to stand in water, particularly in cool or low-light winter conditions.
Prevent smooth spiral ginger problems before they start
Most smooth spiral ginger issues are care-mismatch, not bad luck. Dial in the basics:
Smooth Spiral Ginger problems — FAQ
Why is my smooth spiral ginger thrips on flowers and bracts?
Thrips are attracted to the flowers and soft bracts, causing silvery streaking and distorted inflorescences; treat with spinosad-based insecticide or insecticidal soap and avoid overhead watering which spreads the pest.
Why is my smooth spiral ginger root rot from overwatering or poor drainage?
The smooth-stemmed species is somewhat more sensitive to waterlogging than rougher-leaved Costus; ensure containers have excellent drainage and never allow pots to stand in water, particularly in cool or low-light winter conditions.