Since I don't really know everyone well here I can't recommend anyone from ATP to interview, but what about Beverly from Arbor Gate? She's got a new podcast up (too short IMO...longer podcasts are my speed) but I'd love to hear more about her history with the nursery business.
As for another industry person, I love John Dromgoole and his show out of Austin, I bet he'd be fun to listen to in an interview.