Being a plant collector for the Arnold Arboretum of Harvard University is a wonderful opportunity and privilege. Not only are collectors expected to engage in their activities in a professional manner, but they must meet the high Arboretum standards for plant sourcing and documentation. To equip collectors with the information vital to complete a successful expedition, this manual compiles knowledge and experience from plant collectors past and present, and includes references to necessary academic resources, checklists & templates, and physical materials.