More than 230 different cultivars are featured in the Rose Garden, providing a dazzling summer display. The earliest varieties, including Gallicas, Albas, Damasks, Musks, and Centifolias are followed counterclockwise from the left by the later Hybrid Perpetuals, Hybrid Teas, Floribundas and Grandifloras. This latter group evolved after deliberate hybridization became widespread in the 19th century.

A rose maze containing hardy Rugosa varieties is situated beyond the Rose Garden, bringing the number of rose bushes in this extensive collection to more than 2000.