Green manure | Plants | Gardening Blog | Talk | BBC Gardeners' World: "There are a few green manures to sow now, suitable for a range of soil types:
1. Grazing rye (Secale cereale) improves soil structure. Sow from August to November and dig in the following spring.
2. Winter field bean (Vicia faba) is good nitrogen fixer for heavy soils. Sow from September to November.
3. Mustard (Sinapis alba) is a brassica, so should not be followed by other brassicas in your crop rotation, as this can lead to the build up of diseases such as club root. Gardeners in the south can still sow it now, but those up north should wait until spring.
4. Red clover (Trifolium pratense) is good for loamy soils and fixes nitrogen. Its flowers are a great food source for bumblebees. Again, gardeners down south can probably get away with sowing it now, those up north should sow winter beans instead."
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