GrowSabzHow to grow mung bean in pots
Also called Green Gram, Moong Bean, moong bean, green gram · Vigna radiata
مونگ دال
- ☀️ Sunlight
- 6–8hours daily
- 💧 Water
- 0.8 Levery 2 days, 10 L pot
- 🌡️ Ideal temp
- 20–35°C
- 🪴 Min pot
- 10 L20 cm deep
- 🧺 Harvest
- 60–90days from sowing
- ⚖️ Yield
- 1 kgper 20 L pot
Mung Bean is a heat-lover with no tolerance for cold. It wants 20–35 °C and frost kills it outright. Everything about growing it well comes down to timing — getting it into the season early enough to crop before temperatures fall away.
Short answer
Grow mung bean in a 10 litre container at least 20 cm deep, watering about 700 ml per 10 litres of soil every 2 days, and keep temperatures between 20 and 35 °C. First harvest comes 60–90 days after sowing.
Where to plant it
What size pot does mung bean need?
10 litres and 20 cm deep is the realistic minimum for a single plant. Pick a container below to see what changes.
| Container | Minimum size | Depth | Notes |
|---|---|---|---|
| Pot | 10 L | 20 cm | Use pots with good drainage |
| Grow bag | 10 L | 20 cm | Fabric breathes well, prevents root circling |
| Open ground | — | 25 cm | Ensure good soil drainage and spacing |
| Raised bed | 20 L | 25 cm | Excellent for drainage and soil control |
Watering
How often should you water mung bean?
Every 2 days through the growing season, at about 700 ml per 10 litres of soil — daily in hot weather, every 3 days when it turns cool. Water in the early morning. Drip irrigation or base watering works best.
Too little water
- wilting
- leaf yellowing
- pod abortion
Too much water
- yellow lower leaves
- stunted growth
- root rot
Avoid: overhead watering (can promote fungal diseases); standing water; soggy soil.
Climate
Can you grow mung bean where you live?
No hardiness zone needed — compare your actual temperatures against the plant's own limits.
| Ideal range | 20 – 35 °C |
|---|---|
| Survives | 10 – 40 °C |
| Germinates above | 18 °C — best at 25 °C, about 5 days |
| Flowers drop | above 38 °C, or below 15 °C |
| Sunlight | 6–10 hrs/day, best 8 |
| Frost | Highly sensitive — will not survive it |
The flower-drop thresholds matter more than the survival ones. A plant can be perfectly alive at 40 °C and still give you nothing.
How cold is too cold for mung bean? Check your temperaturesEnter your night low and day high — see if it survives, and if it will cropTimeline
Mung Bean growing stages, day by day
Click any stage to see what's happening. Durations shift with temperature — a warm season runs roughly a quarter faster than a cool one.
Feeding
Fertiliser schedule for mung bean
Feed on the interval below, changing what you give as the plant shifts from making leaves to making fruit.
| Stage | What to use | Per 10 L | Every |
|---|
How to prepare each feed
Common mistakes
Why mung bean fails, and how to avoid it
- A container that is too small
Below 10 litres the root run is too shallow. The plant grows, flowers late, and drops whatever it sets because it cannot support the crop.
- Watering too lightly
A daily splash wets the top few centimetres and nothing else. Mung Bean wants about 700 ml per 10 litres of soil — one deep soak beats three shallow ones.
- Ignoring the flower-drop threshold
Above 38 °C, or below 15 °C, flowers fall before setting. The plant can look perfectly healthy and still give you nothing — shade it through the hottest hours.
- Planting it beside Onion
Onions and other alliums can inhibit the growth of legumes, including mung beans.
- Leaving it out through a cold snap
Mung Bean is highly frost-sensitive. One night below 10 °C can end the plant outright — bring containers in or cover them.
Companions
What to plant with mung bean
Good neighbours
Provides a natural trellis for mung beans to climb, and mung beans fix nitrogen in the soil, benefiting corn.
Repels nematodes and other soil-borne pests that can harm mung bean roots.
Breaks up compacted soil, improving aeration and drainage for mung bean roots.
Provides ground cover and shade, keeping the soil cool and moist, which benefits mung beans.
Keep apart from
Onions and other alliums can inhibit the growth of legumes, including mung beans.
Garlic, like onions, can have an inhibitory effect on the growth of mung beans.
Members of the Brassica family (cabbage, broccoli, kale) can stunt the growth of many plants, including legumes, due to allelopathic compounds or nutrient competition.
Fennel is known to inhibit the growth of many garden plants, including legumes.
Problems
Mung Bean pests and diseases
Each lists the weather that brings it on, so you know when to start checking rather than reacting once it's established.
Aphids humidity any · temp 15-25
Small, soft-bodied insects that cluster on new growth and the undersides of leaves, sucking sap and secreting sticky honeydew. Can transmit viruses.
Whiteflies humidity >60% · temp >25
Tiny, white, winged insects that fly up when the plant is disturbed. They suck sap, weaken the plant, and are primary vectors for Mung Bean Yellow Mosaic Virus.
Spider Mites humidity <50% · temp >27
Tiny pests that cause leaves to look stippled, pale, and eventually turn yellow and drop. Fine webbing may be visible on the undersides of leaves.
Powdery Mildew humidity 50-70% · temp 20-27
White, powdery fungal spots appear mainly on the upper surface of leaves. Causes leaves to yellow and die off prematurely, reducing photosynthesis.
Cercospora Leaf Spot humidity >80% · temp 25-30
Small, circular spots with reddish-brown borders and gray centers appear on leaves. Can lead to severe defoliation and reduced yield.
Mung Bean Yellow Mosaic Virus humidity any · temp >25
Characterized by bright yellow patches alternating with green areas on leaves, leading to stunted growth, reduced flowering, and poor pod development. Transmitted by whiteflies.
Pod Borers humidity any · temp >20
Larvae bore into developing pods, feeding on the seeds inside. Look for small holes in pods and damaged beans. Can cause significant yield loss.
Root Rot humidity high · temp any
Caused by excessive soil moisture and poor drainage. Symptoms include wilting, yellowing leaves, and a soft, mushy root system. Often fatal.
Anthracnose humidity >85% · temp 20-28
Appears as dark, sunken lesions on pods, stems, and leaves, often with pinkish spore masses in humid conditions. Can cause pods to rot.
Bacterial Blight humidity >80% · temp 25-30
Causes water-soaked spots on leaves that enlarge and turn brown, often with a yellow halo. Can spread to pods, causing sunken, dark lesions.
Harvest
When to harvest mung bean
First picking falls between day 60 and day 90, and the plant then keeps producing for about 45 days. Pick often — what you leave on the plant signals it to stop making more.
How to tell it's ready
- Pods are plump and bright green (for fresh eating)
- Pods are dry, brown/black, and brittle (for dried beans)
How much to expect
Storing it: Fresh pods: Refrigerate in a plastic bag for up to a week. Dried beans: Store in an airtight container in a cool, dark place for up to a year.
Questions
Mung Bean: common questions
How long does mung bean take to grow?
About 75 days from sowing to the first harvest, with picking usually starting between day 60 and day 90. It then keeps producing for roughly 45 more days. Warm weather pulls that forward; cool weather pushes it back.
What size pot does mung bean need?
At least 10 litres and 20 cm deep for one plant. A raised bed wants 20 litres of soil and 25 cm of depth.
How often should I water mung bean?
About 700 ml per 10 litres of soil, every 2 days in normal weather — daily when it is hot and every 3 days when cool. Water in the early morning.
What temperature does mung bean need?
It does best between 20 °C and 35 °C and survives from 10 °C to 40 °C. Seed needs soil above 18 °C to germinate, ideally around 25 °C.
Can I grow mung bean in winter?
Not outdoors anywhere that frosts — it is highly frost-sensitive and will not survive it. In a frost-free winter it grows slowly; anywhere colder, treat it as a warm-season crop.
How do I know when mung bean is ready to harvest?
Pods are plump and bright green (for fresh eating); Pods are dry, brown/black, and brittle (for dried beans). Once picked: fresh pods: refrigerate in a plastic bag for up to a week. dried beans: store in an airtight container in a cool, dark place for up to a year.
How much does one mung bean plant produce?
Roughly 1 kg from a 20 litre container, or about 2.5 kg in open ground. Larger containers give proportionally more, up to a point.