Last edited on November 01, 2026. View history
Adzuki Dwarf Bean
Adzuki Dwarf Bean
A variety of bean
A small dwarf bush bean for drying, with numerous thin pods, yellow flowers and small reddish-brown seeds. Grown in Asia for centuries and very popular in Japan. Good in stews and soups. Copes well with drought and wet summers. Transplant at 10 cm once the ground has warmed.
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Adzuki dwarf bean facts
Lifespan
Crop cycle
Max altitude
Optimal light
What are growing degree days?
A plant grows with warmth, not with days. A growing degree day is one day's worth of useful warmth: how many degrees the day's average temperature is above the lowest temperature the crop grows at. Add them up from planting and you know how far along the crop is, whatever the calendar says.
Say that lowest temperature is 10°C. A day averaging 17°C gives 7 growing degree days. A day averaging 8°C gives none, as it is too cold for the crop to grow. That is why the same lettuce takes about 50 days in a summer and 90 in an autumn: it needs the same total warmth either way.
For adzuki dwarf bean, the FAO EcoCrop database gives a lowest growing temperature of 5°C and a shortest growing cycle of 60 days at its best temperature, about 1050 growing degree days to a first harvest.
Where you've told us where your garden is, we use this and the weather there to predict when your adzuki dwarf bean will be ready to harvest. We don't use it for how long a plant lives or when it finishes: we go by what members have logged for that.
Growing adzuki dwarf beans
- Dig the bed and add compost 1 week before sowing
- Put up supports for climbing beans 1 week after sowing
- Water regularly at sowing every week
- Weed carefully 3 weeks after sowing every 2 weeks
- Pick beans regularly at first harvest every week
- Leave some pods to dry for seed 6 weeks after first harvest
- Pull out finished plants and dig in the roots 8 weeks after first harvest
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Ecological requirements
Data from the FAO EcoCrop database for Vigna angularis (Willd.) Ohwi & H. Ohashi
| Family / Taxonomy | Magnoliopsida Rosidae Fabales Leguminosae |
|---|---|
| Life form | herb, vine, sub-shrub |
| Life span | annual |
| Habit | erect, climber/scrambler/scadent |
| Optimal soil depth | medium (50-150 cm) |
| Optimal soil texture | heavy, medium |
| Optimal soil fertility | moderate |
| Optimal soil drainage | well (dry spells) |
| Optimal soil salinity | low (<4 dS/m) |
| Photoperiod | short day (<12 hours), neutral day (12-14 hours) |
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