Troubleshooting
Haygarth's Cape Primrose problems — and how to fix them
Haygarth's Cape Primrose (Streptocarpus haygarthii) 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.
Failure to bloom
This species requires a cool winter rest (nights around 10-14°C) to initiate flower buds; plants kept uniformly warm year-round rarely flower. Move to a cool room or unheated greenhouse in winter.
Aphids on flower scapes
Soft green or grey aphids cluster on emerging scapes and buds, distorting flowers. Treat with a jet of water or insecticidal soap spray, covering undersides of leaves; repeat weekly for three to four weeks.
Prevent haygarth's cape primrose problems before they start
Most haygarth's cape primrose issues are care-mismatch, not bad luck. Dial in the basics:
Haygarth's Cape Primrose problems — FAQ
Why is my haygarth's cape primrose failure to bloom?
This species requires a cool winter rest (nights around 10-14°C) to initiate flower buds; plants kept uniformly warm year-round rarely flower. Move to a cool room or unheated greenhouse in winter.
Why is my haygarth's cape primrose aphids on flower scapes?
Soft green or grey aphids cluster on emerging scapes and buds, distorting flowers. Treat with a jet of water or insecticidal soap spray, covering undersides of leaves; repeat weekly for three to four weeks.