annual Oregon Episcopal School Christmas Wreath & Holiday Greens Sale. The company was still based in Portland in mid-2011, but it relocated its headquarters in fall 2011 to the Tanasbourne area of Hillsboro, Oregon, on the west side of the Portland metropolitan area. It subsequently moved its headquarters one mile to west, no longer in the Tanasbourne area but still in Hillsboro. References Companies based in Hillsboro, Oregon Companies based in Portland, Oregon American companies established in 1890 Plant nurseries Privately held companies based in Oregon Service companies of the United States 1890 establishments in Oregon