How to Grow Cluster Beans UK | Complete Growing Guide

Cluster Bean (Cyamopsis tetragonoloba)

A pile of fresh green cluster bean pods. Photo: Thamizhpparithi Maari, CC BY-SA 3.0, via Wikimedia Commons.

Also known as: Guar · 2 sources cited

The short answer

Ready in: 45–100 days
Site: soil pH 7–8

In the UK, cluster beans are ready to harvest 45–100 days after planting.

Cluster beans (Cyamopsis tetragonoloba) — Frost-tender annual of hot, dry climates.

Quick Facts

Cluster bean pods split open to show the hard flinty seeds — “Cyamopsis tetragonoloba-2-yercaud-salem-India” by Yercaud-elango is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Cyamopsis tetragonoloba-2-yercaud-salem-India” by Yercaud-elango is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Factor	Value
Soil pH	7 - 8
Germination temp	30C
Time to harvest	45-100 days
Soil texture	Well-drained alluvial and sandy-loam soils; tolerates salinity; waterlogging not tolerated
Drainage	Free-draining
Lifecycle	Frost-tender annual of hot, dry climates.

Soil & Growing Conditions

A cluster bean field on light sandy soil — “Goru-chikkudu-kaya (Telugu- గోరుచిక్కుడుకాయ) (4663152727)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons — “Goru-chikkudu-kaya (Telugu- గోరుచిక్కుడుకాయ) (4663152727)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.

Water: Low; 500-800 mm, best seed production below 800 mm

Soil pH range

7 8

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

Harvest & Storage

Freshly picked cluster bean pods on sacking — “Cluster bean for sale” by Surya Prakash.S.A. is licensed under CC BY-SA 3.0. Source: Wikimedia Commons — “Cluster bean for sale” by Surya Prakash.S.A. is licensed under CC BY-SA 3.0. Source: Wikimedia Commons.

When to pick: TNAU: harvesting starts at 45 days in early varieties and at 100 days in late varieties. Pods are picked young for eating, while they snap cleanly.

Cluster bean through the season

A pile of fresh green cluster bean pods — “Cluster bean” by Thamizhpparithi Maari is licensed under CC BY-SA 3.0. Source: Wikimedia Commons — “Cluster bean” by Thamizhpparithi Maari is licensed under CC BY-SA 3.0. Source: Wikimedia Commons.

The vegetable

Young pods picked while they still snap. This is how guar is eaten across India, long before the seed matures.

Young cluster bean plants in rows on dry soil — “Kottavarai (Tamil- கொத்தவரை) (4663779162)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons — “Kottavarai (Tamil- கொத்தவரை) (4663779162)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.

Establishing

TNAU gives spacing of 45 x 15 cm at 10 kg of seed per hectare. Germination is best near 30C.

A cluster bean plant carrying an upright spike of pale flowers — “Guaar (Hindi- गुआर) (4663782814)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons — “Guaar (Hindi- गुआर) (4663782814)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.

In flower

Flowers are carried on an upright spike and pass through pink to light purple.

Close-up of the white flower spike of cluster bean — “Cyamopsis tetragonoloba (4663783848)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons — “Cyamopsis tetragonoloba (4663783848)” by Dinesh Valke from Thane, India is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.

The flower spike

Pods form in the tight clusters that give the crop its English name.

The seed

Hard, flinty, about 5 mm. Milled for guar gum, a thickener PROSEA rates 5-8 times stronger than starch.

Picking

TNAU: harvesting starts at 45 days in early varieties and at 100 days in late ones.

A stand of cluster bean plants in full leaf — “Guar plant” by Tulspal is licensed under CC BY-SA 4.0. Source: Wikimedia Commons — “Guar plant” by Tulspal is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

In leaf

Bushy and erect, 20-100 cm in improved cultivars and up to 3 m in landraces.

Its own conditions

Well-drained alluvial and sandy-loam soils at pH 7.0-8.0. Waterlogging is not tolerated.

Mature cluster bean pods, darkening as they dry — “Amarapayar-ml” by Ramesh NG is licensed under CC BY-SA 2.0. Source: Wikimedia Commons — “Amarapayar-ml” by Ramesh NG is licensed under CC BY-SA 2.0. Source: Wikimedia Commons.

Left to mature

Pods darken as seed fills. Seed maturity comes 110-160 days after sowing.

Cluster bean pods cooked with potato, a common Indian preparation — “Gawar Phali With Aaloo (Guar Bean With Potatoes)” by Miansari66 is licensed under CC0. Source: Wikimedia Commons — “Gawar Phali With Aaloo (Guar Bean With Potatoes)” by Miansari66 is licensed under CC0. Source: Wikimedia Commons.

Always cooked

Green pods carry 40-70 mg hydrocyanic acid per 100 g, removed by thorough boiling. Never eat them raw.

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 cluster beans take to grow?

Typically 45–100 days, depending on cultivar and growing conditions.

What soil pH do cluster beans need?

A pH of about 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.

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How to Grow Cluster Beans UK | Complete Growing Guide

Cluster Bean (Cyamopsis tetragonoloba)

Quick Facts

Soil & Growing Conditions

Harvest & Storage

Cluster bean through the season

References

Frequently Asked Questions

Where To Go From Here

Plan the next step

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How to Grow Cluster Beans UK | Complete Growing Guide

Cluster Bean (Cyamopsis tetragonoloba)

Quick Facts

Soil & Growing Conditions

Harvest & Storage

Cluster 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