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Mung Bean Sprouts - How to Sprout Beans

Gardener's HQ Guide to Growing Mung Beans

The mung bean, scientific name Vigna radiata, is commonly grown as a sprout.

As a member of the of the Fabaceae (legume family) it is closely related to plants such as chick pea and broad beans.

Mung Beans Nutrition

They are rich in bioavailable vitamins, minerals, proteins, amino acids, phytochemicals and energy; such nutrients are vital for human health, and have led to mung beans becoming part of many cuisines.

Mung Bean Sprouts
Mung Bean Sprouts by Crispin Semmens.

How to Grow Bean Sprouts

Mung bean sprouts can be grown both indoors at home and outside.

As well as growing mung beans as sprouts, they can also be planted out in the garden. Late spring, when soils are warm,  is the best time for planting as the soil is warm,  and beans should be able to be harvested in as little as three months (typically 100 days).

Mung bean seeds are usually green or brown, but some tropical varieties are yellow, and they are normally half the diameter of a soybean seed.

The appearance of mung bean plants is more like garden beans than soybeans, and they can grow up to 24 to 30 inches (60–75 cm) tall; they also have smaller leaves than soybeans, and a moderate number of branches.

Pods are three to four inches long, with 10 to 15 seeds each, and there are 30 to 40 pods in every plant.

The color of the pods turns darker as they mature, making it easy for growers to known when harvesting time is nearing.

There are a few varieties of Mung beans available. These varieties include Berken – green-coloured seeds, and preferred by many buyers – and Texsprout, which produces larger seeds than Berken.

Mung Bean Soil Preparation

Proper soil preparation should be conducted when growing mung beans. It is best to conduct planting in the spring after the last frost passes.

The soil should be broken with the use of a garden spade to a depth of at least six inches.

Sprinkle two inches of compost on the top of the soil, and then rake the soil smooth.

Although mung beans are easier to plant than many other bean crops, an ample amount of soil preparation is beneficial.

Planting

The ideal season for mung beans to be planted in most northern hemisphere locations is late May and mid-June, when the weather is not too cold, not too warm, and the last chance of frost has passed.

However, in other parts of the globe, such as in Asia, mung beans should to be planted in mid-November, after the rainy season has passed.

Indoor Planting Mung Beans

For indoor planting, it is essential to use a container that has a drainage hole in the bottom, as mung beans plants will drown when soaked in too much water.

A large clay pot, wooden barrel or other similar container serves well.

Place at least three to five inches (7–12 cm) of soil in the container and make sure that the soil has a neutral pH, from 6.2 to 7.2, to promote healthy sprout growth.

Water the newly planted beans to provide preliminary moisture for germination. Do not overwater. Mung beans will not do well on oversaturated and soggy soil.

Cover the container with a lid, such as a plastic garbage can lid, newspaper, or planter bottom. This will help keep the soil and seeds slightly moist, and will promote the development of sprouts.

Mung Beans sprouts should be seen after about a week; the warmer the temperature, the faster the seed germination.

Place the seedlings in a sunny location to encourage faster growth. It is not advisable for the plants to be watered frequently; wait until the soil becomes dry before watering.

Outdoor Planting of Mung Beans

For outdoor planting, the recommended seeding rate is 15 pounds per acre for wide rows. The soil should have a pH of 6.2 to 7.2, and seedlings sown in a sunny location.

Seeds can be planted directly in rows, at a depth of 1 inch (2.5 cm), spaced at 2 to 4 inches (5–10 cm) apart, and with 30 to 36 inches (75–90 cm) between rows.

The pre-sprouting of seeds before sowing is advisable; this can be achieved by soaking the beans in water for 24 hours.

Next, drain and leave them for another 24 hours until tiny roots start to poke out. Germinated seeds should then be planted straight away to avoid them drying out.

Sow the germinated beans into compost that is about two to three inches deep (5–8 cm), and place tray lids/or other cover over them to keep them warmer during the night.

Seedlings should be seen after about two weeks.

Mung Bean Sprouting

If you are sprouting mung beans for culinary use then follow this simple procedure:

  1. Take the required amount of beans to sprout (bear in mind that the quantity will double once sprouted).
  2. Was in cold water until the water runs clear
  3. After draining, place in a bowl, and imerse in water (about 2.5X the volume of beans should be adaquate).
  4. Soak overnight (10 to 12 hours).
  5. Drain, rinse the beans with water, then drain again
  6. Put the beans in a jar, and cover the lid with a light cloth.
  7. Place the jar in a dimly lit part of the kitchen (out of direct sunlight).
  8. Repeat the rinse and drain cycle for twice a day (first thing in the morning, late in the evening works; about every 8 hours).

    You will see small sprouts after about two days, and if you prefer longer sprouts it will take about five days.

Mung Bean Care

Always make sure that the plant-bed is free from weeds, and supply water when required. Do not overwater the plant, as they are susceptible to drowning.

Mung beans do best in a light to medium rich soil, although legumes can fix their own nitrogen, you may need to supply a low nitrogen 5-10-5 fertilizer of the soil is poor.

Troubleshooting Growing Problems

The mung bean plant secretes a sticky sweet substance that attracts several kinds of insects. Aphids, mosquitoes, cucumber beetles, and many types of worm are attracted, but can be easily controlled using a mild dose of organic the insecticide pyrethrins.

Harvesting Mung Beans

Mung beans start to form once plants reach a height of 15 to 18 inches (38–45 cm), and are typically ready for harvesting 100 days after sowing.

The beans will not mature at the same time, so harvest when about 60% of pods have reached maturity.

Collect the whole plant, tie into bunches, and then hang upside down to dry out over a large sheet of paper.

Once dried it is easy to shell the beans.

For large scale Mung Bean growth, the success or failure of the crop is often determined in the management and harvesting conditions.

As the pods of mung beans are brittle and thin when dry, shattering can be a problem during harvest.

To reduce seed shattering, the preferred harvest method is direct combining which requires plant to defoliate and dry down in a timely manner.

Mung beans planted in May normally dry down and defoliate in September.

Mung Bean Pods
Mung Bean Pods by Mike Fernwood.

The dry seeds can be stored in a glass container for many years, and the viability can be improved by freezing the mung bean seeds, as this destroys insect infestation.


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