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It should not be a standard procedure, but spikes have their place when a TIP cannot be safely established. For example, 100+ foot excluded Douglas-fir trees with <3" branches may be spiked if the climber cannot safely secure a line.
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Wow. As a fellow arborist practicing in the Willamette Valley, I really can't believe that you would say this. Same as Zeb, I have NEVER seen a doug fir I was not able to efficiently establish a line in. If the branches suck, you can go around a number of them or girth to the trunk. I've gone up safely on the tiniest stubs when the rope was girthed to the trunk with a running bowline.
With all the time I've spent climbing huge and tall forest conifers, I am truly amazed when in 2011 we still have practicing arborists claiming that you need spikes to safely climb a tree. Really? If humans can climb the tallest trees on earth without spikes, then surely you can quit your justifications and leave the spikes in the truck when you're pruning that fir tree in Mrs. Smith's front yard!
Joshua, You're spot on; I've climbed a bunch of norfolk island pines and couldn't agree more. Although they require a creative approach, they can be quite fun, no? I attached a photo of my favorite, a 150-year-old at Hong Kong Zoological and Botanical Gardens. The tree has no branches for the bottom 45 ft, and only 1" or less above that, with a wicked lean over a cliff. Being at the top of that tree was EPIC to say the least.