Peter,
'Thor's Hammer' looks very cool. Almost has the look of 'Packardian' for color, but not the velvet. Ed thought 'Packardian' might be from 'Sanfordii' and Patty Drown had some big seedlings out of 'Sanfordii' too.
Thanks for the information on 'Emerson's Giant' vs. 'Emerald Giant' too. I had wondered although mine aren't big enough to tell for sure.
'Springael's Choice' has gotten to 5" across Greg. It has started to split now. I'll make sure to point it out when you're at the clinic.
Kevin