Hyacinth Bean Vine in Zone 5a & 5b
Lablab purpureus
Yes, hyacinth bean vine grows in zones 5a and 5b. Plant it outside May 31–Jun 7.
When to plant hyacinth bean vine in zone 5b
Zones 5a and 5b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | May 31–Jun 7 |
| Estimated bloom | Aug 29–Sep 5 (~90 days after direct-sowing) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 6-12 ft.
Plant alongside it in zone 5b
These go outside within two weeks of hyacinth bean vine in zone 5b, so one planting day can cover them.
- NasturtiumMay 17–May 24
- MarigoldMay 17–May 24
- DelphiniumMay 31–Jun 7
- Angelonia (Summer Snapdragon)May 24–May 31
- Bee BalmMay 24–May 31
- Black-Eyed Susan VineMay 24–May 31
Hyacinth bean is a climbing vine, not a bush, and it needs to be treated that way from the start: this is a vigorous twiner that reaches 6-12 feet in a season and will look for the nearest support to grab onto, so a sturdy trellis has to be in place before or at planting, not added later as an afterthought.
How hyacinth bean vine fits zone 5's season
Zone 5b's frost-free window runs about 148 days, from May 10 to October 5. Hyacinth bean vine needs about 90 days from sowing to first bloom.
Hyacinth Bean Vine planting windows in every zone
Zone 5b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 2a & 2b | Not usually | Jun 10–Jun 17 | Sep 8–Sep 15 |
| 3a & 3b | Not usually | Jun 20–Jun 27 | Sep 18–Sep 25 |
| 4a & 4b | Not usually | Jun 5–Jun 12 | Sep 3–Sep 10 |
| 5a & 5b (your zone) | Not usually | May 31–Jun 7 | Aug 29–Sep 5 |
| 6a & 6b | Not usually | May 16–May 23 | Aug 14–Aug 21 |
| 7a & 7b | Not usually | May 1–May 8 | Jul 30–Aug 6 |
| 8a & 8b | Not usually | Apr 15–Apr 22 | Jul 14–Jul 21 |
| 9a & 9b | Not usually | Mar 8–Mar 15 | Jun 6–Jun 13 |
| 10a & 10b | Not usually | Feb 20–Feb 27 | May 21–May 28 |
| 11a & 11b | Not usually | Jan 22–Jan 29 | Apr 22–Apr 29 |
Bloom dates are about 90 days after the sow or plant-out date.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
Good companions
No well-established companions for hyacinth bean vine.
Where to buy hyacinth bean vine seeds
Varieties we recommend, and where to get them:
- Ruby Moon: Johnny's Selected Seeds' heirloom variety, grown for its purple stems, lilac-rose blooms, and glossy magenta seed pods, good for gardeners who want ornamental and cut-flower value alongside quick coverage. Buy: Botanical Interests Full notes
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See it growing
Search YouTube for "growing hyacinth bean vine" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Hyacinth Bean Vine in USDA zone 5b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.
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