I had fun designing and assisting with the installation of a waterside buffer garden at Lake Hayward, East Haddam, CT. In June 2014, the garden was maturing. (See the photos below.) Yarrow and Penstemon (aka Beardstongue) were in full bloom. Both plants have a lot of ecological value. Penstemon is recognized by the Xerces Society as attracting large numbers of native bees. Yarrow is both attractive to native bees and attracts predatory or parasitoid insects that prey upon pest insects.
See the Lake Hayward garden website.