I always wondered how one could grow their own fertilizer just like Paul Wheaton always promoted, and now I understand, that is why there are edges in the garden like weeds, such as the dreaded kochia, Lactuca seriola, burdock, green orach, sunflowers, feverfew, comfrey, willow braches and just about anything that grows without much irrigation, add to that and all the used coffee grounds I get from my pickup service, all the straw and leaves nobody wants and BAM!!! 140 degrees. so far I have noticed when all the edible leaf plants start losing their value as food, I bail them up and its off to the compost.