As a descendant of the Rodale tradition of compost = garden gold, it can be hard for me to learn that not all compost and not all manures are good.  Some can even be toxic and kill your garden. * National Gardening Association  Clopyralid (herbicide), used in lawn care, has shown up as a contaminant in composting facilities from Pennsylvania to Washington.Clopyralid-contaminated compost can be t…