17) Growing mung bean sprouts

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In this tip:

  • Introduction
  • A)# Quantity
  • B)# Storage and use
  • C)# Growing sprouts in 2 plastic boxes (clinging water)
  • D)# Growing sprouts in a water bath
  • E)# Growing sprouts in a machine (info Gerard)  new
  • F)# Growing thick mung bean sprouts

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Introduction:

Mung bean sprouts can be grown indoors.

When you choose at Youtube  “growing mung bean sprouts ” you’ll find many videos about this topic.

In this tip 2 methods of growing mung bean sprouts are described:

  1. Chapter C#; In a plastic tray with holes in the bottom. Under this tray there is a leak tray. The mung beans are not in water. There is only clinging water after spraying or rinsing the beans. Aluminium foil is folded over the trays to darken. Between the trays and the alu foil there is enough room so air can pass there. I found this procedure on the internet. The English Youtube video is    here    .
  2. Chapter D#; Growing in 2 plastic boxes that are placed on (in) each other. The lower box contains water. The mung beans are in the upper box. The upper box has some small holes in the bottom. This way of sprouting has been invented by Hetty, a Dutch lady.
  3. Chapter E#; Growing in a machine. Info and photos from Gerard.

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A)# Quantity

When you need only few sprouts, you can buy small amounts of mung beans in a garden shop. Price about €3.00 for 100 grams (€30.00 per kilogram).

When you want to grow many sprouts, you better buy the mung beans at specialized greengrocer’s or in a toko for a lower price, about €3.50 per kilogram.  In Holland, mung beans can be bought from September to January.

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B)# Storage and use

Mung beans can be stored in a glass pot with a lid on it.  It is good to use an egg-cup when strewing mung beans.

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C)# Growing sprouts with clinging water

This procedure has been derived from this   video

C1) Needed:

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  • One plastic freezing box (box with no holes).

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  • One plastic freezing box the same size with holes.
  • To make the holes in this box, acts as follows;
    • Drill small holes in the bottom of this box. Diameter of each hole is about 2 millimeters (1/12 inch).
    • You can also drill a big hole (diameter about 6 millimeter (1/4 inch) in each short side of the box. Use it for fast draining of water out of the box.
  • One plastic lid fitting on the freezing box.

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C2) Clean 2 freezing boxes and 1 lid

  • Clean the 2 plastic boxes and one lid in hot dish water. Rinse them in water. Dry the boxes and the lid.

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C3) Put dry mung beans in a plastic box with no holes

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  • Put dry mung beans in the box with no holes. Fill the box with mung beans until “one layer of” mung beans covers about 1/3 of the bottom. During absorption of water the mung beans grow to 3 x the size of dry beans. One layer of soaked beans “fills” the whole bottom of the box.

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C4) Clean the mung beans in water

  • Pour cold tap water in the box with no holes to clean the mung beans.
  • Decant (drain off) water from the box. Keep the beans in the box.
  • Repeat pouring in and draining off water for about 5 times to clean the mung beans well.

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C5) Soak the mung beans in water

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  • Pour cold tap water in the box with mung beans. Water level about 1 to 2 centimeters (0.5 inch) above the beans.

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  • Lay a well fitting lid “loose” on the plastic freezing box with mung beans.
  • Let the beans soak in water at about 18 to 20 C (64 to 68 F).
  • Refresh the soaking water each 12 hours.

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  • After 24 to 36 hours the mung beans have soaked enough. The diameter of soaked beans is about 3 times the diameter of dry ones. One layer of soaked beans fill the whole bottom of the box. Some soaked mung beans can have tiny roots already.

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C6) Put the soaked mung beans in the plastic box with holes

  • Do the next actions above a kitchen sink.
    • Pour water with soaked beans (from the plastic box with no holes) into the box with holes.
    • Let the soaking water drain off through the small holes in the bottom.
    • Use cold running tap water to rinse the mung beans in the box with holes.
    • Hold the box with holes (with mung beans) horizontally for about 10 seconds. Let the mung beans drip out, so most of the water is drained off.

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  • Put the empty freezing box with no holes on the kitchen counter.
  • Put the box with holes (with mung beans) on (in) the empty freezing box.
  • So you end up with 2 boxes on each other.
  • In the upper box (with holes) there are the mung beans with clinging water.
  • The bottom box (no holes in) acts as a leak tray.
  • Put the whole on a table or on another horizontal surface indoors.

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  • Cover the 2 boxes on each other with a folded piece of aluminium foil. Between the underside of the aluminium foil and the table there is a narrow air opening of about 0.5 to 1 centimeter (1/4 to 3/8 inch).
  • Put the whole (2 boxes on each other with a cap of aluminium foil) in a room at about 20 C (68 F).

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C7) Grow mung bean sprouts.

  • Execute the following actions every 8 hours:
    • Remove the cap of aluminium foil from the 2 boxes on each other. Lay the cap on the table.
    • Take the 2 boxes on each other to a kitchen sink.
    • Take the top box (with mung beans and holes in the bottom) fom the bottom box.
    • Rinse the mung beans with cold running tap water. Let the water drain through the small holes in the bottom.
    • Hold the box with holes (with mung beans) horizontally for about 10 seconds. Let the mung beans drip out, so most of the water is drained off.
    • Drain the water from the bottom box. Rinse the bottom box with cold running tap water. Drain the water from the bottom box.
    • Put the box with holes (with beans) on (in) the box with no holes.
    • Put the whole (2 boxes on each other) in a room at about 20 C (68 F).
    • Cover the 2 boxes on each other with the cap of aluminium foil.
    • Repeat these steps after about 8 hours.

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Tiny mung beans sprouts after 2 days of growth.

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C8) Remarks:

  • My experience: cleaning the beans by rinsing with cold water for 5 times (pouring in and draining) is sufficient. During the growth of the sprouts, the beans and/or sprouts do not stink (smell bad).
  • When the sprouts and/or beans do stink (smell bad) during growing, the small mung beans have not been cleaned sufficiently (or they were very contaminated). When the beans or sprouts stink or smell bad, execute as follows:
    • Remove all beans and sprouts from the box. You can put them in a municipal waste container.
    • Clean, rinse and dry all boxes and the lid.
    • Put new dry mung beans in the box with no holes.
    • Clean the beans: repeat pouring in and draining off cold tap water for 10 times.
      • You can use a washing up brush to clean the beans mechanically in the water.
      • You can end up with rinsing the beans in a sieve or strainer under cold flowing tap water.
  • Growing mung bean sprouts under “more airy” conditions;
    • As a test I grew sprouts in 2 systems. One system had an “airy” leak tray.
    • That leak tray has an oblong air opening at both long sides:

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  • Mung beans in 2 systems; a normal leak tray (L) or a leak tray with an oblong air opening (R).

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  • Both systems covered with a cap made of aluminium foil.

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  • Sprouts grown in both systems: normal leak tray (L) or a leak tray with an oblong air opening (R).

Conclusions:

  • Mung bean sprouts grow in both systems just as good.
  • So there is no need to make an extra (oblong) air opening in the long side of the leak tray.

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D)# Growing sprouts in a water bath

D1) Hetty’s method:

Hetty wrote a reaction in the Dutch version of Sjefgardentips (Sjeftuintips). She uses an easier method of mung bean sprouting. She sent me 2 photos for explanation (see further in this post).

Hetty uses 2 empty “mushroom boxes”. In the bottom of one box she made 12 small holes.  In this box she also made 4 holes in the sides and put 2 satay sticks through them. The other mushroom box has not been “adapted”.

Strew dry mung beans in the “not adapted” box. Add tap water. Beans are soaked in this box for 1 or 2 days. Each 12 hours, water is refreshed.

Next step is putting the soaked beans in the box with small holes in the bottom. The water in the “not adapted” box is refreshed. Then the boxes are put on (in) each other. The water level is somewhere between half way and the top of the beans in the upper box. Each 12 hours, water is refreshed.

This growing method works well.  Hetty sent me these photos that I may use in my weblog.  Thank you, Hetty.

Hetty’s growing set made of 2 mushroom boxes and 2 satay sticks.

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D2) Hetty’s method using freezer boxes:

I tested the method of Hetty using 2 freezer boxes (instead of mushroom boxes). Below a description.

D3) Boxes:

You can grow mung bean sprouts in freezier boxes that have a special form, as shown on the photos below. These boxes are sold in a shop for household goods.

These boxes have a flat bottom and a “special” sidewall. When you put one box on (in) another box, there is a room of about 0.5 inch high below the upper box. So you don’t need satay sticks as shown at the mushroom boxes.

For each growing set you need one “normal” box and one box with small holes in the bottom.

In one box there are 5 small holes, one in the center and one at each corner. How to make the holes: Hold a small block of wood at the inner side of the box and drill a small hole in the bottom starting at the outer side. You can also make these holes using a awl and a block of wood. Size of the holes is 1/12 to 1/8 inch (2 to 3 mm).

Then drill a bigger hole in one side of the box. Diameter about 1/4 to 1/3 inch. This hole is at about 0.5 inch from the bottom. Use this hole for fast draining water or when you want to remove the skins of the mung beans.

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D4) Soaking in cold tap water

There has been a test with many mung beans in a box or with few beans in a box.

Left side box: many beans. Right side box: few beans. Lay the covers loose on the boxes. Put the boxes in a room at 20 to 25 C (68 to 77 F). Refresh the water each 12 hours.

After approx 2 days the beans have grown and the skins have bursted. Left “many beans”, right “few beans”.

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D5) Growing mung bean sprouts

  • Do these actions at “many beans” and at “few beans”.
  • Pour (put) the soaked beans in a box with holes in the bottom.
  • Rinse the box with no holes under cold running tap water.
  • Put some cold tap water in the box with no holes.
  • Put the box with beans in (on) the box with no holes. The beans are half to completely covered with water.
  • Put the whole on a dark place at about 20 C (68 F).

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D6) Rinsing and refreshing:

  • Rinse the growing sprouts under running cold tap water.
  • Refresh the water in the bottom box.
  • Do these actions every 8 hours.

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D7) Harvest.

Above you see a photo of sprouts after 6 days of growing. Left box: “many”.  Right box: “few”.

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On this photo some sprouts from each group; left side “many”, right side “few”.

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D8) Conclusions

  • Mung bean sprouts in the “many” group are smaller than in the “few” group.
  • Do not put to many dry beans in a box.
  • Covering about 1/3 of the bottom of a box with dry mung beans is okay.

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D9) Summery

  • The method of Hetty is a good one. It is very easy to make a growing set out of 2 (freezer) boxes. Just making some holes in one box. If desired you can easily remove the bean skins.
  • Pay attention to the amount of beans that you strew into the box; Maximal about 1/3 of the bottom surface covered.

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D10) More sprouts

When you want to grow more sprouts, use bigger boxes. For example boxes like the ones on the photos below.

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These boxes are used and described in chapter C)# Growing sprouts with clinging water.

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E)# Growing sprouts in a machine (info Gerard)

Gerard, living in Brasil, made a comment on Sjeftuintips, the Dutch version of Sjefgardentips. Gerard has sent me info and photos about growing mung bean sprouts in a sprout machine.

There are 2 plateaus with beans (one on each other) in the machine. A rotating sprayer sprays warm water on the beans.

Mung bean sprouts grown in the machine.

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Working method (info Gerard)

Below a description of growing sprouts in the machine (info from Gerard)

E1) Weighing beans and sorting out

  • Weighing 150 grams of mung beans.

  • Sorting out and removal of bad beans.

  • Good mung beans; 143 grams

  • Bad beans (broken, dried out, weird colour).

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E12 Washing beans

  • Add (mineral) water to the mung beans in the tray.

  • Put a lid on the tray. Shake the whole above the kitchen sink.

  • Pour water and beans out of the the tray in a sieve.
  • Put the beans from the sieve back into the tray.
  • Repeat this washing (add water, shake, drain off) several times.

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E3) Weighing water, heating water and pouring in

  • Weigh 1150 grams of water in a pan.

  • Heat the water in the pan to 38 C (100 F).

  • Pour all water in the water tank (water reservoir).

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E3) Building up and beans in the machine

  • Put the green compartment on the water reservoir.

  • Divide the washed mung beans over 2 plateaus.

  • Remove plastic tube,
  • Put the first plateau with beans in the machine,
  • Put the second plateau with beans on top of the first plateau with beans,
  • Put the plastic tube in the machine again.

  • Put the rotary sprinkler on op of the plastic tube,
  • Put the machine at a place with enough ventilation (air circulation).

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E4) Switching on and use

  • Put the power plug into the mains socket.
  • Push the on/off button (plug symbol).
  • Push the right ambient temperature button (thermometer symbol).

  • The pump starts and water spraying begins.
  • This step takes about 1 minute. Then the pumping and spraying stops.
  • (Each time there is 1 minut of spraying water after 20 minutes of pause).

  • Put the black cover (“Batman”) over (on) the machine.
  • During the growing of mung bean sprouts, the black cover is on the machine.
  • Let the mung beans germinate and grow in the machine (power plug in the mains socket and tool on).

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E5) Growing sprouts and refreshing (renewing) water

  • Pull the power plug out of the mains socket after 12 hours of processing.
  • Remove the black cover.
  • Take of the sprinkler (sprayer).
  • Remove the green compartment and the 2 plateaus with mung beans.
  • The photo above shows mung beans after 12 hours of germinating.

  • The water in the machine has turned brown.
  • Pour the water out of the tool.

  • Remove brown stains using a moist cloth or a piece of kitchen paper.

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  • Pour fresh warm water in the water reservoir of the machine.
  • Build up again;
    • Put the green compartment on the water tank (water reservoir).
    • Put 2 plateaus with mung beans (one on each other) in the compartment.
    • Put the water tube in the tool.
    • Mount the sprinkler (sprayer).
    • Put the black cover over the machine.
  • Put the power plug into the mains into the mains socket.

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  • During growing, the sprouts on the lower plateau force up the upper plateau with growing sprouts.

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E6) Water refreshment, cooling storage water and harvesting

  • Refresh water again (as described at chapter E5) ) after 24 hours.
  • Put a bottle with 1.8 liter of fresh water in the refrigerator. You can store the sprouts in the cooled water after 1 more day of growing sprouts.
  • After 24 more hours, the sprouts are big enough to harvest. This is 60 hours after start.
  • Take the plateaus with sprouts out of the machine.

  • On this photo you see the 2 plateaus with mung bean sprouts.

  • Take the sprouts from the plateaus.
  • Break off the roots from all sprouts. The roots can be put in a compost container.
  • Breaking off roots can take a long time.
  • Gerard is going to find out if breaking off roots can be improved.
  • (Perhaps using scissors or a sharp knife while the sprouts are in the plateau ??)
  • Put all sprouts in a tray or bowl.
  • Starting with 150 grams of mung beans, Gerard can grow 1042 grams of moist sprouts (with roots) within 60 hours of processing. Dry sprouts without roots; 648 grams.

  • Pour the cold (cooled) water in the bowl filled with sprouts. Sprouts can be stored for several days like that.

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E7) Info about the machine

Parts:

  • Base station with green compartment,
  • Two plateaus,
  • water tube,
  • Rotary sprinkler,
  • Lid,
  • Black cover.

Base station with water reservoir.

Control panel; 1 on/off button and 3 buttons for 3 ambiant temperatures.

Base plate info 220 volts, 50 hertz, 20 watt.

  • Pump (middle of the photo),
  • Heating element (orange strip at the right side of the photo),
  • Print board with components (clock, pump on/off, heating element on/off).

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F)# Growing thick mung bean sprouts

The sprouts that grow using this method are thinner than the sprouts that you can buy at a greengrocer. See photos below;

tauge-shop-1 “Greengrocer sprouts”

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“Home grown sprouts”

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In these sites there is info about growing thic(ker) sprouts:   sv-jedi   (in Dutch)  and  sproutpeople     .

Both sides advice to put a weight on the sprouts during growing…..

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