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Interesting. The practice follows the same method used on the pollarded sycamores in Golden Gate Park. Except they do it annually.
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Gerry, the reason for doing it annually in S.F. is probably that the regrowth is much heavier on the west coast than in cold Scandinavia. After all, we haven't had redwoods or anything like it around here for a few (quite a few) million years.
When you pollard a tree, it takes a keen eye and a good sense of aesthetics and proportions to do the first cutting. After all, that is going to shape the tree for the rest of its life, you can't really change it later on.
I'll readily agree, that whicever swede did the tree in the video for the first time, could have done better, but we can't blame mr. dreadlocks for that. If you watch again,while thinking pollarding instead of topping, you'll see that he only cuts away new growth.
Last year my crew did a whole bunch of sycamores that had been left unpruned for 6-7 years. They looked awful, but as we cut away the big (and I mean big) suckers, it turned out that the guy doing the original work on the trees, had been really good. So we ended up with a nice result.
The big problem about pollarding comes when people let it slide and forget to keep up with pruning. Then you end up with ( especielly with basswood) huge suckers, that make new tops with very bad attachment points and eventually break off in an icestorm or sometime just for no apparent reason at all.