Well-known gardening blog. Touches on an array of gardening topics and is entertaining to read. Waxes political occasionally, but generally sticks to gardening.
Recipe for a “moss starter”. Easy to make, paints on clear to nearly any surface, and eventually grows into a moss design. Some examples on this blog entry of moss graffiti artwork.
The “Mythbusters” of gardening. A Master Gardener publication that tests all sorts of gardening myths and declares them true or false.
City of Chicago: Chicago’s Green Rooftops
16-page free, online instruction manual from Chicago mayor Richard Daley. Part of an initiative to promote urban agriculture, energy conservation, and neighborhood (rooftop) beautification in Chicago.