One of my old standby's is Thompson & Morgan's Seed Germination Database .. It's an awesome place to start .. here is a link:
http://www.backyardgardener.co...
Once you get there, start scrolling down til you see Suggested Sowing Times, scroll down just a bit more and you'll see a kazillion plant genus's with all the info you need.
Also note that this is out of print and hasn't been updated in umpteen years probably but so far since I've been using it it's been right on.
About 8 years ago I copied it into a Word file and printed it out. If anyone would like the file just T-Mail me with your email address.
