Hi. I am a new member, after having stumbled upon a Guerrilla Gardening site the other day. I found it while searching for native, drought-tolerant grasses and flowers to plant in my front yard here in El Sereno, LA. Actually to plant in my "frontage". But, I'm not sure that is the right term. I am referring to the strip of land between the sidewalk and street, and have seen it referred to as "frontage," "parkrow," "parkway," and "devil's strip." Any ideas what to call this thing?
While discovering this site and others, it dawned on me it might be necessary to make seedbombs to spread the grasses/wildflowers to other surrounding "frontage" plots. I live in El Sereno and there is a plethora of land waiting for a good bombing - frontages, vacant lots, parts of the median on Huntington. Of course, I want to wait until the weather cools - perhaps October or so - and begin a sustained seedbomb campaign, via bicycle, in the El Sereno area.
In planning this though, I've come across one bump. Where do I find a clay powder to mix with seeds and compost? This isn't something I've noticed at the nursery (San Gabriel Nursery

). For instance, the clay mentioned here -
http://www.guardian.co.uk/environment/video/2008/apr/25/seedbombingI really like the work people have done so far! And am excited to start making local contributions!