Howard's Grove Hospital was primarily used for smallpox patients--so burial may have occured on-site.

From:
http://www.ci.richmond.va.us/visitor/monumentsmemorials.aspx

Historic Cemeteries

The City of Richmond, Department of Parks, Recreation & Community Facilities operates seven municipal cemeteries. Although all of them have historical interest, the three that are particularly noteworthy are Shockoe Hill, Oakwood, and St. John's Church.

The Shockoe Hill Cemetery is located in the downtown area of Richmond on Hospital Street. Within its grounds are buried such luminaries as John Marshall, the revered U.S. Supreme Court Justice; Elmira Shelton, said to be Edgar Allan Poe's fiance and inspiration for the "lost Lenore" of his poem, "The Raven"; and John Allan, Poe's boyhood friend; Peter Francisco, the Revolutionary War Hero; 220 Confederate and 577 Union soldiers; and Elizabeth VanLew, the union spy who operated a "safe" house during the War Between the States. This cemetery is on Virginia Landmarks Register and National Register of Historic Places.

Oakwood Cemetery is located at 3101 East Nine Mile Road. It is the final resting-place of 17,000 confederate soldiers, casualties from several battles fought in the Richmond area during the War Between the States. According to information in the book entitled, "The Dahlgren Affair" by Duane Schultz, Yankee Colonel Dahlgren was buried in a secret grave in Oakwood Cemetery in March 1864 and removed by Elizabeth VanLew under cover of night on April 6, 1864. The body was taken out of Richmond by VanLew under a wagonload of peach trees and reburied the next day on a farm at Hungary Station. His body was returned to Philadelphia in October 1865 for burial in North Hill Cemetery. For more information, call 804-646-4473.

Meanwhile, the following are good reading:

http://www.mdgorman.com/Hospitals/howards_grove_hospital.htm

http://www.civilwarflorida.com/site/locations/show_location.php?locationREF=235