Is there anything so romantic as a backdrop of classic white climbing roses? With this beautiful and strange variety of climber. Sally Holmes gives huge rose clusters that resemble Hydrangea heads. Each grouping is filled with buff-colored buds that open to white single flowers. Despite their frail appearance, the blooms last well even in heat, and are hardy in colder temperatures, too. Temperature affects the color of these flowers, and you'll see a deeper bud color when cool.