Mung Bean

About

Mung bean (*Vigna radiata*), also known as green gram, is an annual vine with yellow flowers and fuzzy brown pods. It reaches heights between 15–125 cm (6–49 inches). The plant has a well-developed root system with numerous slender lateral roots bearing nodules that facilitate nitrogen fixation. Stems are highly branched, sometimes twining at the tips, and can be purple or green when young, maturing to grayish-yellow or brown. Leaves are ovate, measuring 6–12 cm in length and 5–10 cm in width. The plant produces racemes with yellow flowers, leading to elongated cylindrical pods containing 12–14 seeds each. These seeds vary in color—green, yellow, brown, or blue—and can be either cylindrical or spherical in shape. Mung beans thrive in full sun and require well-drained soil with consistent moisture. They are drought-tolerant but perform best with regular watering, especially during flowering and pod development. Propagation is primarily through direct seeding. Sow seeds 2.5–5 cm deep in warm soil after the last frost. Germination occurs within 4–5 days under optimal conditions. Harvest occurs approximately 60–70 days after planting. Pods are ready when they turn brown and dry. For sprout production, seeds can be harvested earlier and germinated indoors.

Permaculture Functions

• Edible: Small green Vigna radiata seeds cook quickly as dal, noodle sprouts, and sweet Asian pastes while yellow-seeded lines suit flour and confection -- pods mature unevenly in about 60–70 warm days, so pick dry brown cylinders before shatter drops seed in the row.
• Nitrogen Fixer: Cowpea-group rhizobia nodulate the branched root system, leaving residual nitrate for the following cereal or solanum crop when vines are incorporated green -- inoculate with the correct strain on new ground so nodules fill instead of staying empty ornaments.
• Ground Cover: Low-branching annual vines with trifoliate leaves shade soil between summer vegetables, smothering late-germinating weeds once rows close -- best after soil stays above 65°F (18°C) so seed rots do not erase the stand.

Companion Planting

Threats & Pressure