Those seeds were initially "Yvonne's Salvia". I got them from Emily on GardenWeb
http://tech.groups.yahoo.com/g...
Emily's plants get as big as Yvonne's did. Mine never have been anywhere near that though. Yvonne selectively saved her seeds, only those from the biggest plants. One big difference is that Yvonne and Emily used high test chemical ferts, and I never do. I try to keep it organic in my yard. (though I do use chemical ferts in pots). Usually mine get to 4', the same height as my chain link fence you see above.
Yvonne didn't know the name of them, though most who grow them agree that they're some strain of salvia splendens. The seeds have never been available commercially, only available from someone who has grown them. It was Yvonne's wish that they be shared among home gardeners, not sold for profit. Sadly, Yvonne died last year. Emily is still growing six footers, though.
Karen