Here's some research and results of seed viability in space. I'm posting it here instead of the botany forum because this one is so much more active, and I thought some of you might be interested.

http://earthsky.org/space/how-well-can-seeds-survive-in-space?mc_cid=9d47c9f235&mc_eid=bc894e62fd

The website, Earthsky.org also sends out daily emails about anything pertaining to science of the earth and sky, including pictures sent in by people from all over the world. Enjoy!