The Whetstone Park of Roses in Columbus has a great collection of well-maintained beds with a wide variety of roses; some 11,000 rose bushes at last count. They also have some shade gardens, an herb garden, and more. The park is part of a City of Columbus park.

They host an annual Rose Festival each June... including the Columbus Rose Club's Annual Rose Show and Exhibition. Details are at the City web-site: http://recparks.columbus.gov/events/RecParks_2.asp .