Located a mile south of Caledonia Ohio off OH-746 at the dead end of Marion Williamsport Road, it includes a parking area, shelter house, and trails. A geocache is located on the property, and a launch area for canoes and kayaks is located across the river, on Whetstone River Road.

Trella Romine donated 12 acres for the park in 1998. In 2004 Ralph Boger donated an additional two acres that include a former spring and ford across the Olentangy (formerly Whetstone) River.

On Trella’s passing in February of 2013, her son David Haldeman continues the tradition of welcoming guests to tour the gardens at the annual Open Garden on Earth Day Weekend Sunday in April at 1536 Whetstone River Road North (on the other side of the river), or by appointment through the year.

From mid-April until mid-May more than 30 species of spring wildflowers are in bloom. The area has 40 species of native trees and shrubs.

The Ohio Department of Natural Resources designated Terradise as an “outstanding environmental education area that possesses exceptional value in illustrating and interpreting the natural heritage of Ohio.”

The spring bird migration brings many transient species to join the fifteen or more resident species. Terradise is notable for the diversity of the native trees and plants growing there. Some of these are hickory, walnut, oak, ash, beech, Ohio buckeye, pawpaw, black cherry, hackberry, hawthorn, maple, box elder, mulberry, willow, and poplar. In April the blooming wildflowers include spring beauties, Dutchman’s britches, trout lilies, trilliums, violets, bloodroot, wild ginger, bloodroot, perfoliated bellwort, Solomon’s seal, smilacina, and jack-in-the-pulpit.