ARTICLE BY: VANESSA GARDNER NAGEL Vanessa Gardner Nagel, APLD, NCIDQ is a member of HPSO, and a Nationally-Certified Landscape Designer, Author, and Lecturer. She’s served as a Design judge for Garden Design Magazine at 2018 NWFGS, and the upcoming 2018 APLD International Design Competition. She owns Seasons Garden Design, an award-winning, sustainable landscape design company serving the Portland, OR and SW Washington regions. *** Sometimes designers have to travel far away to discover great garden ideas. A few years ago while visiting Rome, I saw an intriguing soil retention method on the Palatine Hill. There, 5” diameter logs were driven…