Christmas tree cultivation major Christmas tree growing region, Douglas-fir has always been the primary species grown. A full one-half of all trees produced in the Pacific Northwest are Douglas-fir. Douglas-firs typically take five to seven years before they are mature enough to sell as Christmas trees. Also common in the region are noble fir, a tree which commands a higher price than Douglas-fir, and grand fir, which accounts for about 10 percent of the annual harvest in the Northwest. Other species collectively account for only 3–5 percent of the total Northwest harvest. In North America, Fraser fir, grown in the Appalachian Mountains of
Douglas E. Noble at UC Berkeley. His dissertation focused on implementing an early computer-supported issue-based information system (IBIS), and he was a co-author on a research paper on IBIS with his dissertation chair Horst Rittel. Books: Edited Journals and Conference Proceedings: Catalog: Video: Douglas E. Noble Douglas E. Noble is an American architect and tenured faculty member at the USC School of Architecture. He is a fellow of the American Institute of Architects. He is known for his work in four overlapping arenas: Architectural Computing, Building Science, Architecture Education, and Design Theories and Methods. He received the ACSA/AIAS New Faculty Teaching Award in