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How to Grow Adzuki Beans USA | Full-Season Growing Guide

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Adzuki Bean (Vigna angularis)

A handful of dried red adzuki beans on a pale surface. Photo: Ong Jyh Seng, CC BY-SA 4.0, via iNaturalist.

2 sources cited

The short answer

Ready in
80–120 days
Site
soil pH 5–7.5

In the UK, adzuki beans are ready to harvest 80–120 days after planting.

Adzuki beans (Vigna angularis) — Frost-tender annual, though the least heat-demanding of this group and the one most suited to a temperate summer.

Quick Facts

A handful of dried red adzuki beans on a pale surface — “Vigna angularis angularis” by Ong Jyh Seng is licensed under CC BY-SA 4.0. Source: iNaturalist
“Vigna angularis angularis” by Ong Jyh Seng is licensed under CC BY-SA 4.0. Source: iNaturalist.
Factor Value
Soil pH 5 - 7.5
Optimal growing temp 15-30C
Time to harvest 80-120 days
Soil texture Wide range of soils provided they are well drained
Drainage Well-drained
Lifecycle Frost-tender annual, though the least heat-demanding of this group and the one most suited to a temperate summer.

Soil & Growing Conditions

A green field of adzuki bean plants in full leaf — “Shiroazuki1” by のりまき is licensed under CC0. Source: Wikimedia Commons
“Shiroazuki1” by のりまき is licensed under CC0. Source: Wikimedia Commons.

Water: Moderate; 500-1750 mm annual rainfall

Soil pH range

5 7.5

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

Harvest & Storage

Dried adzuki bean pods hanging on the plant — “Vigna angularis fruit” by 최옥석 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Vigna angularis fruit” by 최옥석 is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

When to pick: Pods dry and the seeds rattle. PROTA gives a growth duration of (60-)80-120(-190) days depending on cultivar.

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 adzuki beans take to grow?

Typically 80–120 days, depending on cultivar and growing conditions.

What soil pH do adzuki beans need?

A pH of about 5–7.5. 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

Almost everything on this page resolves to your own frost dates rather than the calendar — the last spring frost moves by roughly two months between zone 3 and zone 10. The USA Garden Planner works from your zone so the timing is already decided before the season starts.

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SoilCommander Editorial Team

US vegetable growing guides · Adapted for USDA hardiness zones and US frost dates

Every SoilCommander guide is written and maintained by our editorial team for real US growing conditions, adapted to USDA hardiness zones and US frost-date data, with Cooperative Extension growing advice cited directly where a crop-specific source exists.

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