;D Hi Zoglet, sorry I have taken a while to get back to you.....
Apart from comfrey my knowledge of green manure is limited. I must say the more I read about it the more interested I have become and think I may have a go at it myself. I think I will go more for the winter green manure, so it will feed the soil ready for spring..... but if you have loads of land you could do both summer and winter.... fascinating subject, so off to do some more research. Keep us posted on how your green manure project progresses......
Found this information and video clip and thought you may find it useful reading and something helpful to listen to......
www.bbc.co.uk/gardening/basics/techniques/soil_growgreenmanure1.shtml
Another link that may be helpful.....
www.kitchengardens.dial.pipex.com/greenmanure.htm
Best wishes... aromatic xx
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However small your garden, you must provide for two of the serious gardener's necessities, a tool shed and a compost heap: Anne Scott-James