I just saw this story in the New York Times about a community center in the Bronx teaching the homeless gardening skills. Either the reporter didn't understand what was going on, or the "skills" being taught are fairly useless. First, they're dusting all their cuttings with Vitamin B1 shows up in this list of gardening myths to beware of. The reporter also quotes the teacher telling them how to root cuttings and telling them not to tear the bark... Um, okay. But you know, wounding is a key step in cutting propagation. Some studies have found actually crushing the stem with a hammer works wonders.
I love the idea of teaching people down on their luck how to garden -- gardening is the best therapy. But how about actually teaching them to garden not spreading myths?