Troubleshooting
Trailing Cape Primrose problems — and how to fix them
Trailing Cape Primrose (Streptocarpus prolixus) 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.
Flower failure in summer heat
Temperatures consistently above 27°C suppress bud formation and cause existing buds to drop. Move to a cooler spot in summer (ideally below 24°C) and provide good ventilation to restore flowering.
Sciarid fly (fungus gnats)
Sciarid fly larvae feed on roots and organic matter in the compost, particularly when overwatered. Allow the surface compost to dry slightly between waterings and use yellow sticky traps to monitor adults; drench with a biological control (Steinernema feltiae nematodes) for heavy infestations.
Prevent trailing cape primrose problems before they start
Most trailing cape primrose issues are care-mismatch, not bad luck. Dial in the basics:
Trailing Cape Primrose problems — FAQ
Why is my trailing cape primrose flower failure in summer heat?
Temperatures consistently above 27°C suppress bud formation and cause existing buds to drop. Move to a cooler spot in summer (ideally below 24°C) and provide good ventilation to restore flowering.
Why is my trailing cape primrose sciarid fly (fungus gnats)?
Sciarid fly larvae feed on roots and organic matter in the compost, particularly when overwatered. Allow the surface compost to dry slightly between waterings and use yellow sticky traps to monitor adults; drench with a biological control (Steinernema feltiae nematodes) for heavy infestations.