Formal Garden Entryway
Regardless of this being a formal garden or any other garden style, I really like stone and rock applied to elements like this entryway. As well as the design and atmosphere that stone brings to the garden or landscaping, the pemanence is obvious. See arches and arbors for more examples and ideas for entrway arbors and arches for all garden styles including formal gardens. Also see free garden arbor plans to build one yourself.