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 of the 2017 American Institute of Architects Los Angeles Chapter Presidential Honor as educator of the year. Noble completed a Bachelor of Science in Architecture and a Bachelor of Architecture at California State Polytechnic University, Pomona, and both a Master of Architecture and Ph.D. at the University of California at Berkeley. His doctoral dissertation built on the work of Horst Rittel by creating a computer supported Issue-based information system. Noble taught for a few years at UC Berkeley and then joined the faculty of the USC School of Architecture in 1991. Noble has taught at USC since 1991, focusing on