Why Your Jasmine Isn't Blooming: The Cool-Dark Requirement

Getting Jasmine (Jasminum polyanthum) to Flower Indoors

Jasmine grown as a houseplant often produces lush foliage but no flowers. The secret is a specific seasonal regimen that mimics its natural cycle.

The Bloom Cycle

Jasmine typically blooms in January–February. To initiate buds, it needs a 6–8 week period in autumn (October–November) with:

• Cool nights: 40–50°F (4–10°C)
• Complete darkness at night: No artificial light after sunset.
• Bright daytime light: South or west window.
• Reduced watering: Keep soil slightly drier.
• No fertilizer.

Year-Round Schedule

If You Can't Provide Cool/Dark

The plant will stay healthy but may bloom sparsely or not at all. Even a few weeks of cool nights helps. Prune hard in late winter regardless—flowers form only on new growth.

Watch for spider mites (common on jasmine); spray with soapy water at first sign.