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Prune one of the branches to a length of 6 to 10 inches. Gently bend the limb to an upright position and hold it in place with a stake and string (Fig. 8B). Finally, prune the other branches in the whorl back to restore the pyra-midal shape of the tree. Pruning pines will stimulate bud development from the needle bunches below each cut. These buds willFile Size: KB. The best time to prune a Douglas fir tree is during their dormant phase, which is early spring, before any new growth commences, or during their semi-dormant phase in mid-summer.
Early spring is preferable as the new growth will quickly fill the gaps. To control height, prune the leader while the trees are dormant. These conifers form buds along their stems, so make a cut half an inch or so above a bud. The topmost bud will become the new leader. This cut will also stimulate outward growth of the buds below. Lightly trimming back the outermost branch tips during dormancy will also encourage fullness when the tree pushes new growth in spring. Video: How to Prune Fir, Douglas Fir, and SpruceEstimated Reading Time: 8 mins.
Sep 21, If you leave a nub on the end of the branch when trimming, the branch will not fuse back to the trunk as easily and may cause decay.
To avoid this, prune the branch off just after the slight swelling of the branch collar. Don't over prune. Heavy pruning is not necessary for Douglas-fir trees, and only needs to be done once a year at the most.