Irish moss (Sagina subulata) seed is available from many sources. If you do a search you'll get a lot of sources. Sorry, can't help with your other question.
Irish moss can be grown in zones 4 to 9. You are probably in zone 6. Here's a zip code zone finder. http://www.gardenweb.com/zones/zip.cgi Use this site to search out reputable mail order sources or search by state or zip code. http://davesgarden.com/gwd/ Newt
