While in Ireland we were quite honored to spend the day with the Earl of Longford, Thomas Packinham, who has been collecting and planting species of trees on his family estate for the past 50 years.  His gardens are exquisite and he had an encyclopedic knowledge of all things trees.  A real kindred spirit, he's traveled all over the world to photograph trees and uncover their stories and has written 4 books on his findings.  We could hardly keep up with him as he led us through the arboretum (and yes, past his giant castle!)