Green manure comes from plants cut down before they are ripe, smashed up with a spade and dug into the soil.
It has been said that by doing this, it is an ideal replacement for using manure and compost. This is not the case.
Many green manures can cause nitrogen starvation when dug into the ground. This happens because the bacteria have to use the nitrogen from the soil in order to rot the green manure down.
So, not a good idea. However, there is one exception to this rule and that is to use lupins which have nitrogenous nodules on its roots. When lupins are used as green manure there is no serious nitrogen robbing.
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