"Sacred groves were common among the ancient Germans, and tree-worship is hardly extinct amongst their descendants at the present day. How serious that worship was in former times may be gathered from the ferocious penalty appointed by the old German laws for such as dared to peel the bark off a standing tree. The culprit's navel was to be cut out and nailed to the part of the tree which he had peeled, and he was to be driven round and round the tree till all his guts were wound about its trunk. The intention of the punishment clearly was to replace the dead bark by a living substitute taken from the culprit; it was a life for a life, the life of a man, for the life of a tree."
--From James Frazer's The Golden Bough, chapter IX, "The Worship of Trees"
"The Hidatsa Indians of North America believe that every natural object has its spirit, or to speak more properly, its shade. To these shades some consideration or respect is due, but not equally to all. For example, the shade of the cottonwood, the greatest tree in the valley of the Upper Missouri, is supposed to possess an intelligence which, if properly approached, may help the Indians in certain undertakings; but the shades of shrubs and grasses are of little account."