Assertion: douglas fir | /r/ObjectUse | used as a christmas tree
Facets:
value: since the 1920s
type: TEMPORAL
value: in the pacific northwest
type: LOCATION
value: widely
type: DEGREE
value: commonly
type: TEMPORAL
Source sentences:
text: Douglas-fir has been commonly used as a Christmas tree since the 1920s, and the trees are typically grown on plantations.
text: Although not important as a source of timber, Fraser fir is widely used as a Christmas tree.
text: The Douglas fir has been used as a Christmas tree in the Pacific Northwest since the 1920s, because it was one of the most commonly found in the area.
text: In North America the balsam fir, or balsam, popular as a Christmas tree and the source of Canada balsam , is native to the Northeast; the Fraser fir, or she-balsam, grows in the Alleghenies and is used as a Christmas tree; and the noble, alpine, and red firs are found at high altitudes and the grand, silver, and white firs on lower mountain slopes in the Northwest.