The Dugald MacKenzie Rose Gardens is divided into three main areas. The Plant Variety Rights (PVR) rose variety reference collection is at one end. The central section features roses in formal rectangular beds arranged in a circle around a central water feature. The other end of the garden holds the trial beds for the New Zealand Rose Society Inc.'s International Rose Trials.
The International Rose Trial Grounds are of world repute. A special noticeboard explains to visitors how the trials are conducted, and the winning roses are kept in the gardens for six years.