Araucaria bidwillii is a fast-growing tree 30-50 m tall, with a diameter of 1.5 m, and a straight, undivided trunk often free of branches for two-thirds of the tree height and showing little taper in this part of the bole. The crown is normally symmetrical and dome shaped (parabolic), tending to change from a pointed to a flattened apex with age. The drooping branches are themselves unbranched, with the leaves clustered at the ends. As the lower branches die, dormant buds become active at the base of each branch and a secondary, dome-shaped crown may develop below the primary one. Bark is persistent over the trunk and branches, with thin scales up to 2.5 x 7.5 cm. The outer surface of the bark is rough, bumpy, dark brown to black, covered with prominent leaf scars, and the cut blaze is red, grading to orange.

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