There's a mix of decorative plants, shrubs, vegetables and herbs. The gardener, Dorothy Mulan (I know this from the notice in the tomato and fruit cage) encourages people to "pick a reasonable amount of flowers and vegetables." There's even a scissors provided to snip the tougher herbs.
If you happen to be in the area, go take a look. You'll find the Mulan's garden on the corner of Patton Ave and Wilton St, Princeton, NJ.