I have tried all the usual Green Manures (see previous thread as mentioned above).
I now would only use Limnanthes ... it provides excellent ground cover, is fairly hardy, provides early nectar for bees and other beneficials, looks pretty, and is quick and easy to dig out and compost (or dig in, as you prefer).

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~ What do I think of Western civilisation? I think it would be a very good idea ~ Gandhi