Burls occur on many kinds of trees the world over. The general consensus is that they are caused by stress to the tree - often by trauma, virus, and other causes (how's that for circular reasoning, eh?). They are often prized by wood carvers for their fantastic grain patterns. If you're like me seeing scatological humour in all kinds of thing you might have thought I should have titled this post - 'Mr. and Mrs. Spruce Awaiting the Blessed Day'.
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