Grand Fir Medium Native to Southwestern British Columbia down into Northern California and east into Montana! Grand Fir is a very large, deep green tree which, unlike most firs, grows in lowlands rather than mountains. Needles are 3/4 to 2 1/2 inches long, arranged in thin layers, almost as if pressed in a book! Grand Firs grow somewhat more rapidly than other Firs, attaining mature heights greater than 300 feet! 100% Guaranteed!