Black-Eyed Susan Vine in Zone 3a & 3b
Thunbergia alata
When to plant black-eyed susan vine in zone 3b
Zones 3a and 3b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Black-Eyed Susan Vine needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Apr 18–Apr 25 |
|---|---|
| Direct sow / transplant outside | Jun 13–Jun 20 |
| Estimated bloom | Sep 21–Sep 28 (~100 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 3-8 ft.
Black-eyed Susan vine shares a common name with a plant it is not related to, and the confusion is worth clearing up first.
How black-eyed susan vine fits zone 3's season
Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Black-Eyed Susan Vine needs about 100 days from transplant to first harvest.
Good companions
No standout companions recorded yet for Black-Eyed Susan Vine.
Where to buy black-eyed susan vine seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing black-eyed susan vine" 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 Black-Eyed Susan Vine in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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