Morning Glory in Zone 4a & 4b
Ipomoea purpurea
When to plant morning glory in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Direct sow: Direct-sow outside. Morning Glory doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated bloom | Aug 12–Aug 19 (~75 days after direct-sowing) |
Spacing: about 4 square feet per plant (square-foot-gardening spacing). Mature height: 8-10 ft.
Morning glory is less a flower you plant and more a vine you manage. It starts twining and climbing within days of germinating, and in warm zones it will self-seed aggressively enough to become a recurring weeding chore rather than a one-season planting. The payoff is funnel-shaped blooms in blue, purple, pink, or white on a vine that will climb 8 to 10 feet given the chance.
How morning glory fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Morning Glory needs about 75 days from sowing to first harvest.
Good companions
No standout companions recorded yet for Morning Glory.
Where to buy morning glory seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing morning glory" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Morning Glory in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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