Christmas tree cultivation species are grown as Christmas trees, although a handful of varieties stand out in popularity. In the United States, Douglas-fir, Scots pine and Fraser fir all sell well. Nordmann fir and Norway spruce sell well in the United Kingdom, the latter being popular throughout Europe. Like all conifers, Christmas trees are vulnerable to a range of pests. The final stage of cultivation, harvesting, is carried out in a number of ways; one of the more popular methods is the pick-your-own tree farm, where customers are allowed to roam the farm, select their tree, and cut it down themselves. Other farmers
Douglas E. Noble Grant in 2011 for research related to the Samuel Freeman House, a residence designed in 1924 by Frank Lloyd Wright. Together, Noble and Kensek have received several awards for their innovative "NotLY: Not Licensed Yet" support system for individuals preparing for the Architect Registration Examination. In addition to completing several buildings as an architect, Noble is a widely recognized leader in championing and mentoring emerging architecture professionals. Noble founded the Ph.D. program at USC Architecture, and he has published articles and organized symposia on doctoral education in architecture. Noble completed a Ph.D. in the Design Theories and Methods (DTM) group