Dawes Arboretum is located in Newark, Ohio, east of Columbus. It's a 1,149 acre collection of gardens founded in 1929 by Bertie and Beman Dawes. Inspired by their love of trees and nature, they wanted to create a lasting legacy on their property.
Some of the gardens include, an All Season Garden, which can give you excellent ideas for how to keep your garden blooming year round, an Azalea Glen, which is great to visit in the spring, a conifer glen, a cypress swamp, which is one of the northern-most bald-cypress swamps in North America (if you visit in the spring, you may see Jefferson and Spotted Salamanders.), a Japanese garden, and the Daweswood house garden. If you have time, you may want to tour the Daweswood House which has been turned into a museum.
You'll also want to visit the Outlook tower - a 36-foot tower which provides quite a view at the top. If you like hiking, you may want to allow time to explore the East trails on the property. A word of caution, though, these trails can get really muddy after it rains, and sometimes the terrain is a little uneven.
Dawes Arboretum is open daily from 7:00 AM until sunset. Admission is free.