organic manure?

HI all im wondering if anyone knows anything about planting seeds that you leeve to grow then dig in as a mulch i think at a later date could be organi manure im not sure but any info will be interesting and sounds good in new raised beds
Hopefully Alan4711
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It is called green manure alan-there is loads of information on the web to look at-others no doubt will chip in with their experiences
A gardeners world clip on the subject-quite informative
http://www.bbc.co.uk/programmes/p009sy6s
Magic many thanks sotojust the job
Good luck
Alan