Volunteers are needed to tend to the huge gardens at Graycliff. This plant is baptisia or false indigo. Photo courtesy Graycliff. Graycliff, an architectural gem with historic gardens, will hold a series of gardening classes starting Saturday, March 25, at the Graycliff Estate, 6472 Old Lakeshore Rd., Derby. Graycliff is also recruiting volunteers to help in the gardens. An information session and tour will be held Wednesday, March 29 at the Graycliff Estate. The gardens at Graycliff were designed by…