Adzuki Beans

Adzuki beans (Vigna angularis) are small, glossy, dark-red beans cultivated in East Asia for centuries, particularly prized in Japanese cuisine. The plant is a compact, dwarf bush growing to around 60 cm tall, bearing yellow flowers and numerous thin pods. It is a warm-season annual that thrives in full sun and well-drained soil, and performs surprisingly well under variable moisture conditions. The dried beans are high in protein and fibre and have a sweet, nutty flavour.

Growing

Direct-sow seeds 2 cm deep into warm soil once it consistently reaches 18 °C. Space plants 10 cm apart in a diagonal grid. Alternatively, start seeds in trays and transplant once the second true leaves appear — this protects young seedlings from birds and slugs. Choose a sunny, sheltered position with good air circulation. Time sowing so that pods mature as temperatures begin to fall toward 14 °C.

Care

Water regularly but avoid waterlogging; adzuki beans tolerate short dry spells better than most legumes. No staking is required for dwarf varieties. Do not over-fertilise with nitrogen — as a legume, the plant fixes its own. Mulch around the base to conserve moisture and suppress weeds. Remove any yellowing pods promptly to encourage continued production.

Harvest

For dried beans, harvest when pods turn yellow and begin to rattle but before they split open. For fresh eating, pick young green pods while still tender. Dried bean harvest takes approximately 100–120 days from sowing. Pick promptly once pods reach the yellow stage — the harvest window is narrow, around two weeks, as pods split and shed seeds quickly.

In the kitchen

Adzuki beans are a cornerstone of East Asian cooking. Use them in sweet red bean paste for mochi, dorayaki, and other confections, or cook them in savoury stews, soups, and rice dishes. No soaking is required for dried beans and cooking time is shorter than most legumes. They can also be eaten fresh as green pods, sautéed or steamed.

Storing

Store dried adzuki beans in an airtight container in a cool, dry place for up to two years. Cooked beans keep refrigerated for up to five days or can be frozen in portions for up to six months. Fresh green pods are best used within a few days of picking or blanched and frozen.