Who needs dirt to have a garden? At the upcoming Non-Dirt Talk [http://cantaloupealone.blogspot.com/2012/04/brooklyn-non-dirt-talk.html], urban greenscaping professional Bob Hyland and hydroponic farmer Gwen Hill will discuss ways to grow food using modern gardening methods. Curated by Cantaloupe Alone [http://cantaloupealone.blogspot.com] and hosted