Moonflower in Zone 3a & 3b
Ipomoea alba
When to plant moonflower in zone 3b
Zones 3a and 3b share the same average frost dates in our data, so this page covers both.
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Moonflower tolerates either.
| Start indoors | Apr 25–May 2 |
|---|---|
| Direct sow / transplant outside | May 30–Jun 6 |
| Estimated bloom | Aug 28–Sep 4 (~90 days after planting) |
Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 10-20 ft.
Moonflower is a morning glory that runs on the opposite schedule. The flowers, white trumpets six inches across, open in the late afternoon and close at dawn, and they're scented for a pollinator most gardeners never see: hawkmoths and sphinx moths, working the plant after dark. If you sit outside on a summer evening you can sometimes watch a bud unwind in a couple of minutes.
How moonflower fits zone 3's season
Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Moonflower needs about 90 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Moonflower.
Where to buy moonflower seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing moonflower" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 3b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Moonflower in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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