How to Grow Hyacinth Beans UK | Planting & Establishment

Hyacinth Bean (Lablab purpureus)

A pink hyacinth bean flower against a deep purple leaf. Photo: Cephas, CC BY-SA 4.0, via Wikimedia Commons.

Also known as: Dolichos Bean, Indian Bean · 2 sources cited

The short answer

Ready in: 60–65 days
Site: soil pH 4.4–7.8

In the UK, hyacinth beans are ready to harvest 60–65 days after planting.

Hyacinth beans (Lablab purpureus) — Perennial climber, usually grown as a frost-tender annual.

Unlike an annual crop, the work here is front-loaded into establishment: get the planting and the site right and the same plants crop for several seasons.

Soil & Growing Conditions

Hyacinth bean climbing over a boundary wall in full growth — “Hyacinth vine Lablab purpureus IMG 0654” by Don McCulley is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Hyacinth vine Lablab purpureus IMG 0654” by Don McCulley is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Water: Moderate to high; rainfed on 750-2500 mm annual rainfall

Soil pH range

4.4 7.8

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Quick Facts

A hyacinth bean pod forming behind the spent flowers — “JfLablabpurpureus6439Candabafvf 05” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “JfLablabpurpureus6439Candabafvf 05” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Factor	Value
Soil pH	4.4 - 7.8
Optimal growing temp	22-35C
Time to harvest	60-65 days
Soil texture	From deep sands to heavy clays; tolerates aluminous soil
Drainage	Well-drained
Lifecycle	Perennial climber, usually grown as a frost-tender annual.

Harvest & Storage

White hyacinth bean flowers beside flat green pods — “JfLablabpurpureus6451Candabafvf 02” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “JfLablabpurpureus6451Candabafvf 02” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

When to pick: Green pods are ready 60-65 days after sowing in improved cultivars and continue for 90-120 days. Mature dry seed is a separate, much later harvest at 150-210 days.

Hyacinth bean through the season

A pink hyacinth bean flower against a deep purple leaf — “Lablab purpureus 'Ruby Moon' JRVdH 01” by Cephas is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Lablab purpureus 'Ruby Moon' JRVdH 01” by Cephas is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Why it is grown for looks

The purple-leaved cultivars are sold as ornamental climbers in Britain, and flower reliably against a warm wall.

Pink and purple hyacinth bean flowers on dark purple stems — “Lablab purpureus 'Ruby Moon' JRVdH 03” by Cephas is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Lablab purpureus 'Ruby Moon' JRVdH 03” by Cephas is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Flower colour

Flowers run white to deep purple, carried in many-flowered false racemes.

The deep purple-red trifoliate leaves of a Ruby Moon hyacinth bean — “Lablab purpureus 'Ruby Moon' JRVdH 04” by Cephas is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Lablab purpureus 'Ruby Moon' JRVdH 04” by Cephas is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

The foliage

Alternate, three-part leaves with ovate-triangular leaflets reaching 15 cm.

Habit

A climbing or bushy perennial up to 6 m long with a well-developed taproot, usually grown as an annual.

A hyacinth bean vine in leaf and flower — “JfAlauli7626Lablabfvf 07” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “JfAlauli7626Lablabfvf 07” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

In growth

Tolerates a wider soil range than anything else in this group, from deep sands to heavy clays.

Pod set

Improved cultivars fruit 60-65 days after sowing and keep going for 90-120 days.

Young pods

Flat, oblong-falcate pods 4-15 cm long. Picked young they are boiled as a vegetable.

Hyacinth bean pods and flowers carried together on the vine — “JfLablabpurpureus6451Candabafvf 08” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “JfLablabpurpureus6451Candabafvf 08” by Judgefloro is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Flowering and podding together

The plant carries both at once, so picking is staggered over weeks.

Purple hyacinth bean flowers and young pods — “Hyacinth bean (Lablab purpureus) flower and pods in Bangladesh” by Md. Mahian is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Hyacinth bean (Lablab purpureus) flower and pods in Bangladesh” by Md. Mahian is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Purple-podded forms

Pod colour follows flower colour in the ornamental selections.

Field scale

Grown across the tropics for food and fodder. Dry seed needs 150-210 days, well beyond a British season.

References

2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.

Frequently Asked Questions

How long do hyacinth beans take to grow?

Typically 60–65 days, depending on cultivar and growing conditions.

What soil pH do hyacinth beans need?

A pH of about 4.4–7.8. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

Plan next season before the problems start

Most of the advice on this page comes down to timing and spacing — sowing at the right moment, rotating beds, and giving plants enough airflow. The UK Garden Planner lays your plot out month by month so those decisions are already made before the season starts.

Get the UK Garden Planner →

Instant PDF download · Written for UK growing conditions

SoilCommander Editorial Team

UK vegetable growing guides · Checked against RHS & Met Office guidance

Every SoilCommander guide is written and maintained by our editorial team for real UK growing conditions, and reviewed against Royal Horticultural Society growing advice and Met Office climate data before publication.

Vegetable Growing Guides UK

Relevant next steps

Where To Go From Here

Take this crop from reading into a written plan for your own beds.

UK garden plannerTurn this crop guide into sowing dates, bed layouts and a harvest record. All growing guidesBrowse every crop we cover for your region, A to Z. Planting CalendarSee how this crop fits alongside everything else you are growing.

Plan the next step

Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.

Get Planner

How to Grow Hyacinth Beans UK | Planting & Establishment

Hyacinth Bean (Lablab purpureus)

Soil & Growing Conditions

Quick Facts

Harvest & Storage

Hyacinth bean through the season

References

Frequently Asked Questions

Where To Go From Here

Plan the next step

Join our email list

Your cart is empty

Your cart is empty

How to Grow Hyacinth Beans UK | Planting & Establishment

Hyacinth Bean (Lablab purpureus)

Soil & Growing Conditions

Quick Facts

Harvest & Storage

Hyacinth bean through the season

References

Frequently Asked Questions

Where To Go From Here

Plan your veg garden before you dig a single inch

Plan the next step