Douglas FirDOUGLAS FIRPsudotsuga menziesii The needles of a Douglas Fir are dark green or blue-green, 1-1.5″ in length, and soft to the touch. HARDINESS ZONES | 4-6MATURE HEIGHT | 40-70 ft SOIL | Acidic or NeutralSITE | Full sun and partial shade. Deep, moist, well-drained soil