2 weeks ago, I hosted a Seedbomb Making party at my house. A few good friends attended and by the end of the night we had over 60 seed bombs and at least 2 cases of empty beer bottles. This party was also helping me prepare for the bottling stage of my homebrew. :)
While researching seedbombs, I bookmarked these sites as a few of my favorite. The very first site has the recipe we used:
http://freedomgardens.org/2010/10/04/make-your-own-seed-balls/ - Recipe is straightforward. Perfect!
http://mademoisellechaos.blogspot.com/2010/03/make-your-own-seed-bombs.html - Tried this recipe out first. The newspaper was fun to play with and making heart-shaped seed bombs was pretty sweet, but they ended up being too dry for our climate.
http://www.guerrillagardening.org/ggseedbombs.html - Great website! This page details a variety of seedbomb recipes.
http://heavypetal.ca/archives/2007/03/how-to-make-seedballs/ - A west coast urban gardener
I thought this should be as free as possible. Somehow, it didn't feel as genuine if I had to buy the ingredients. So, I used clods of clay dug from the permie plot at the Tonopah Community Garden, dry compost from my own backyard bin, and a combination of loose seeds from everyone who came to the party. We ended up with regional wildflowers, vegetables, and herbs.
After they dried up, I took the dog for a walk and "planted" a few. I was picky about where I planted my bombs. I chose spots that I knew would receive some water from run-off or sprinkler. Also, the spots were generally overgrown, weedy, trashy areas that could use something pretty. I plan on keeping track with photos over the next few weeks to see if anything grows. How Vegas...always a gamble.