permaculture

[paul wheaton <paul@richsoil.com>]

Many people think their commercial compost is great because stuff is
doing better with it than their stuff did with cement-like dirt.  That
compost probably has persistent herbicides in it that is stunting
plant growth. But the only way to know for sure is to grow a bunch of
plants next to same species/variety plants that are grown in compost
that definitely doesn't have it.

http://www.youtube.com/watch?v=GunQ9mB0ywU