Hyacinth Bean
Lablab purpureus
Family Fabaceae
Thomas Jefferson grew hyacinth bean at Monticello, and one look explains why: purple stems, lilac pea-flowers, and then the showstopper — clusters of glossy magenta pods so lacquered and jewel-like that visitors will ask if they're real. It drapes an arbor in weeks, not months.
Bees work the flower spikes all summer while the vine shrugs its way up 10 to 15 feet of fence or teepee. Treat it as pure ornament — the raw beans and pods are toxic without careful traditional cooking — and it's the easiest drama an annual can offer. One packet, one spectacular season.
Full Sun
Moderate water
Very Fast growth
Attracts bees
None winter chill
From the print shop
Growing hyacinth bean? Hang it.
Our Plant Library collection carries hyacinth bean — Lablab purpureus, print Nº 242, “Hyacinth Bean.”
526 designsfrom $12.99white or black backgroundmatte poster, unframed
Will it thrive where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what hyacinth bean actually needs.
Life cycleAnnualHyacinth Bean · Common problems
Common hyacinth bean problems
Pests
1 problem on file
- Almost none
Diseases
1 problem on file
- Almost none
Hyacinth Bean · Growing & propagation
Growing hyacinth bean
- Light
- Full Sun
- Water
- Moderate
Soil- Average, well-drained · pH 6.0 - 7.0
Fertilizer- None
Nitrogen-fixer
Pruning- None
Direct-sow after frost at a support; it rockets up, blooms purple, and hangs shiny burgundy pods. Grown mostly as an ornamental.
Spacing- 6-12 in at a trellis
How to plant & propagate hyacinth bean
- Propagate
- From seed
Hyacinth Bean · Calculators & field guides
A little help in the garden.
Hyacinth Bean · Yearly calendar
The hyacinth bean year, month by month
Jan
No calendar activity is listed for this month.
BloomBloomJune to November
What each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
Hyacinth Bean · Ecology & uses
Ecology & uses
Lablab purpureus
Hyacinth Bean in the garden system
- Vine layer vine
- N-fixer
- Nectary/insectary
Attracts- Bees
- Moisture
- Facultative / average
Deer- Browsed
Protect young plants
Origin- Introduced
What hyacinth bean is grown for
! Some parts toxic — see notesRaw beans/pods TOXIC (cyanogenic) — ornamental unless properly cooked with water changes
Use- Ornamental vine
- Use
- Fast arbor cover
- Use
- Purple pods
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
Hyacinth Bean · Varieties & cultivars
Choosing a hyacinth bean variety
'Ruby Moon' (the standard purple-podded); species
Sources & plant identity
Know what you’re growing.
See where the knowledge comes from.
Hyacinth Bean
Lablab purpureus
The plant, at a glance.
- Botanical name
- Lablab purpureus
- Plant family
- Fabaceae
- Growth habit
- Vine · Annual
- Origin
- Introduced
- USDA plant symbol
- LAPU6
- Invasive risk
- Low
Hardiness, size and timing vary with your cultivar, soil and climate.
Rooted in research.
University extension research, brought together with hands-on growing experience at Story Thyme Farms.
Questions
Hyacinth Bean questions, answered straight.
Is hyacinth bean safe for kids and pets?
With care. Raw beans/pods TOXIC (cyanogenic) — ornamental unless properly cooked with water changes Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
How do you propagate hyacinth bean?
From seed.
Elsewhere
Where hyacinth bean sits in the library.
Sweet Pea
Morning Glory
Clematis
Wisteria