Woody Plant Conference at Swarthmore College

I'm currently at the guest house of Swarthmore College, near Philadelphia in Pennsylvania, in preparation for the Woody Plant Conference held there today. I'm giving a talk on 'The Diversity of New Trees', alongside several other speakers covering subjects as diverse as root structure, forest management and the introduction of shrubs from the wild. The event is organised by a consortium of gardens in the area, but hosted by the Scott Arboretum of Swarthmore College. The plantings of the Scott Arboretum are located through the grounds of the college and include a wide range of trees, from magnificent natives to choice new introductions. In this climate of summer heat and humidity (thank goodness for air conditioning!) trees grow incredibly well. Outside my bedroom window is a superb Ginkgo, which must be at least 25 m and 120 cm diameter, and this is just one of many magnificent specimens on the campus. Unfortunately I can't upload pictures at the moment, but will do so as soon as I can.