Mung Bean

A small, green legume most commonly known as the source of bean sprouts, but also excellent as a cooked dried bean. Mung beans are fast-growing and heat-loving, producing small pods that are easy to harvest and shell. The beans cook quickly without soaking and are used in Asian desserts, savory dishes, and ground into flour for noodles. Sprout them indoors year-round for a crunchy, nutritious addition to salads and stir-fries in just four to five days.

Direct sowing is the preferred method as mung beans grow so quickly that transplanting offers little advantage. Sow seeds 1 inch deep in warm soil above 65°F for best germination in 5-7 days. No pre-soaking is necessary though it can speed germination by a day or two. For sprouting indoors, soak seeds overnight, then rinse and drain twice daily in a jar covered with cheesecloth, keeping in a warm, dark place. Sprouts are ready in 3-5 days when tails reach 1-2 inches.

The Season Plate

Your Mung Bean Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Mung Bean May – Jul, pick Aug – Oct. Set your climate below and every date on this plate re-times itself.

Sowing window

May – Jul

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Jul 19

≈ 65 days from sowing · 30-50g per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Mung Bean reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Mung beans are warm-season legumes that grow quickly, maturing in just 60-90 days from sowing. Direct sow seeds 1 inch deep and 2-4 inches apart in rows 18-30 inches apart after all danger of frost has passed and soil temperatures reach 65°F. These compact bush plants typically grow 12-24 inches tall and require no staking or support.

Water consistently during germination and early growth, then reduce watering as plants establish. Mung beans are relatively drought-tolerant once their root systems develop but benefit from regular moisture during flowering and pod formation. Avoid overhead watering which promotes fungal diseases on the dense foliage. Mulch around plants to conserve moisture and suppress weeds.

As nitrogen-fixing legumes, mung beans require minimal fertilization and actually improve soil fertility for subsequent crops. They make excellent short-season cover crops and can be planted between longer-season vegetables. In warm climates, multiple successive plantings are possible from late spring through midsummer. Mung beans are also the easiest bean to sprout at home, providing fresh nutrition year-round regardless of outdoor growing conditions.

Mung beans work well as a short-season intercrop between rows of longer-season vegetables like tomatoes, peppers, and corn. Their nitrogen fixation benefits neighboring plants and subsequent crops. Plant alongside cucumbers and squash which benefit from the soil nitrogen. Marigolds help deter bean beetles when planted nearby. Avoid planting near alliums which can inhibit legume growth. As a fast-growing cover crop, mung beans are excellent for filling gaps between other plantings.

The Society Table

Corn belongs beside it. Onion doesn't.

Old growers' knowledge, checked against Mung Bean's real companion table below — test any plant you're growing.

Grows well in the company of · 2

CornCucumber

Keep apart · 2

OnionGarlic

Plant Mung Bean with good neighboursThe planner flags conflicts before they're in the ground

Mung beans prefer well-drained, sandy loam soil with a pH of 6.0-7.2. They tolerate poor soils reasonably well thanks to their nitrogen-fixing ability. Avoid heavy clay soils that retain excessive moisture. Work in compost before planting but skip nitrogen fertilizer entirely. A light application of phosphorus and potassium at planting supports healthy root development and nitrogen fixation. Inoculate seeds with appropriate Rhizobium if the soil has not previously grown mung beans or cowpeas.

Ideal Temperature

Hardiness Zone Compatibility

For dry beans, allow pods to mature fully on the plant until they turn brown and dry. Harvest when 90% of pods are dry by pulling entire plants and hanging to finish drying. Thresh by beating dried plants inside a bag or container to release beans. For sprouts, harvest homegrown mung bean sprouts when tails are 1-2 inches long, typically 3-5 days after soaking. For green pods, harvest when pods are plump but still green for use as a snap bean, though this is less common.

Storage & Preservation

Dried mung beans store exceptionally well in airtight containers in a cool, dry place for up to 2-3 years. Freeze dried beans for 48 hours after harvesting to kill any weevil eggs before long-term storage. Fresh sprouts should be refrigerated and used within 3-5 days. Mung beans can also be ground into flour for making glass noodles and other Asian staples. For sprouting year-round, keep a supply of dried beans and sprout small batches every few days for continuous fresh supply.

Troubleshooting Common Problems

Uneven maturity is common, with pods ripening over several weeks rather than all at once, making harvest timing challenging. In humid conditions, pods may shatter and drop seeds before harvest. Yellow mosaic virus transmitted by whiteflies can devastate crops; use resistant varieties in affected areas. Poor germination often results from cold, wet soil; wait for warm conditions. Mung beans may lodge in heavy rains due to their shallow root systems; avoid planting in exposed, windy locations.

Growing Tips

1. Wait for genuinely warm soil — mung beans planted in cool soil below 18°C (65°F) germinate poorly and are prone to damping off. Use a soil thermometer and be patient; these fast-growing plants make up lost time quickly once conditions are right.
2. Skip the nitrogen fertilizer entirely. As legumes, mung beans partner with Rhizobium bacteria to fix atmospheric nitrogen. Adding nitrogen fertilizer actually suppresses nodule formation and wastes money. A light phosphorus-potassium application at planting is all they need.
3. Inoculate seeds with cowpea-type Rhizobium inoculant before planting if your soil has never grown mung beans, cowpeas, or adzuki beans. The correct bacteria may not be present naturally, and without them nitrogen fixation cannot occur.
4. Plant in successions two to three weeks apart from late spring through midsummer for a continuous harvest rather than one overwhelming flush. Mung beans mature in just 60-75 days, so even short-season gardeners can fit in two plantings.
5. Harvest timing is critical — pods shatter easily when fully dry, scattering seeds on the ground. Harvest when most pods are brown but before they become brittle. Morning harvesting when pods are slightly damp from dew reduces shattering losses.
6. Use mung beans as a fast summer cover crop between spring and fall plantings. They grow quickly, fix nitrogen, suppress weeds with their dense canopy, and can be turned into the soil as green manure in as little as 45 days.
7. For indoor sprouting, use only food-grade seeds not treated with fungicides. Rinse sprouts twice daily without fail — stagnant moisture breeds bacteria. Keep sprouts in the dark for plump white sprouts, or expose to indirect light for the last day if you prefer green-tinged sprouts with more chlorophyll.
8. Water consistently during flowering and pod fill — this two-to-three-week window determines your yield more than any other factor. Even brief drought stress during flowering can reduce pod set by 30-50%.