Christina Pfeiffer is a horticulture consultant, instructor, and garden writer with over 30 years experience in landscape management and arboriculture. Sustainable and efficient landscape techniques are a special area of her interest and expertise. In addition to being a frequent horticultural speaker, Pfeiffer has taught courses in pruning, arboriculture, and landscape management at Edmonds and South Seattle Community Colleges, and at the University of Washington. She is a contributing writer and member of the Washington Park Arboretum Bulletin editorial board. Christina holds degrees in horticulture from Michigan State and the University of Washington and is an ISA Certified Arborist. She is co-author with Mary Robson of Month-by-Month Gardening in Washington & Oregon.