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Green Manure Crops & Crop Rotation

There are many benefits to growing green manure crops, mainly to improve soil conditions for growing your next crop of healthy vegetables. These benefits include higher nitrogen availability, additional organic matter, increased beneficial micro organisms, improved soil structure and water retention, breaking up hard soil, and in some cases soil fumigation and weed suppression.  I would highly recommend growing green manure plants as part of a crop rotation strategy – don’t have one? I’ll show you how 🙂

What is green manure?

Green manure consists of leguminous plants such as those in the peas, beans and grass family which have nitrogen fixing capabilities. Liberally distribute or broadcast seeds in your pots or garden plot, and after around 6 weeks, “chop and drop” these plants and dig it into the soil and leave to break down for 1-2 weeks to add nutrients back into the soil. Don’t wait till it begins to flower or fruit or you will lose these nutrients.

For our tropical climate in Singapore, I would suggest the following:

  • Mustard seed
  • Cowpea
  • Pigeon pea
  • Soy bean
  • Green bean / Mung bean
  • Winged bean
  • Lab Lab

If you happen to forget to chop and drop your plant in time, at least you can eat the pods of pea and bean plants, or use mustard seeds, leaves and flowers in your cooking. If you are looking to purchase some of these seeds, I have cowpea and lablab available here. I will eventually update this post to include links where you can buy these seeds.

Cowpea plant