Hyacinth Bean reaches harvest about 90 days after sowing. Notably, it handles dry spells once it's established. Its flowers are a moderate draw for honeybees and native bees, even though the harvest is the prize. A nitrogen-fixer, it draws nitrogen from the air and feeds it back to the soil — turn it under or leave the roots in place, and the next planting inherits a richer bed.
Zones
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pH Range
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Sun
Full Sun
Days to Maturity
90
Score Hyacinth Bean on your exact land.
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See Hyacinth Bean
What Hyacinth Bean is
Hyacinth Bean reaches around four feet at maturity.
How to grow Hyacinth Bean
Hyacinth Bean is ready to harvest about 90 days after planting. Hyacinth Bean does best in full sun. It needs around 2,500 growing degree days to mature, which is why climate matters as much as soil.
USDA Zones
Data pending
Soil pH
Data pending
USDA PLANTS Database
Sun
Full Sun
Growable Ground plant catalog
Drainage
Data pending
Growable Ground plant catalog
Days to Maturity
90 days
Growable Ground plant catalog
GDD Required
2500+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
Growable Ground plant catalog
Mature Height
4 ft
Growable Ground plant catalog
Start the season right
Plant hyacinth bean in full sun.
Match the soil
Pull a soil test from your local Extension lab to confirm pH and drainage match hyacinth bean's needs before planting. It fixes its own nitrogen, so skip the high-nitrogen feed and instead dust the seed with a matching rhizobium inoculant at sowing.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at maturity
Hyacinth Bean is ready about 90 days after sowing (University Extension production guides). Watch for cultivar-specific ripeness cues and pick at peak.
Good to know
One caution for pet owners — hyacinth bean is toxic to dogs and cats (mild severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)
Hyacinth Bean offers moderate value to bees and other pollinators.
Where Hyacinth Bean thrives
Whether hyacinth bean thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Hyacinth Bean will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether hyacinth bean actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Hyacinth Bean in my zone?
Zone data for hyacinth bean is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
How long does Hyacinth Bean take to grow?
Hyacinth Bean is ready to harvest about 90 days after planting (University Extension production guides). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Hyacinth Bean?
Time hyacinth bean to your own season rather than the calendar. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Hyacinth Bean need?
Hyacinth Bean needs full sun — a spot that catches six or more hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Hyacinth Bean need?
Specific pH data for hyacinth bean is pending. A soil test from your local Extension lab confirms what your site needs.
Does Hyacinth Bean attract pollinators?
Yes — hyacinth bean's flowers are a solid nectar source for honeybees and native bees.
Is Hyacinth Bean safe for pets?
Hyacinth Bean is toxic to pets (dogs,cats) with mild severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)