I've just finished knitting this hat, with a cable pattern of stylised trees. The trees themselves are based on a binary tree structure, but have twists and knots around themselves and around other branches. The way the branches converge into a cluster reminded me of groves of dogwood, hence the name.
The trunk expands (via a pair of decreases and increases), then splits into two branches. These branches twine once around themselves then split again, the four split branches twining before dividing yet again into a meshwork of twisting branches that stretch to the top of the hat.