'Isobel Harkness' rose Description
Photo courtesy of Margaret Furness
Deep yellow Hybrid Tea.
Registration name: Isobel Harkness
Exhibition name: Isobel Harkness
Deep yellow. Moderate fragrance. 28 to 34 petals. Average diameter 6". Very large, full (26-40 petals) bloom form. Blooms in flushes throughout the season.
Bushy, upright. Semi-glossy, dark green, leathery foliage.
Height: 2' to 30" (60 to 75cm). Width: 18" (45cm).
USDA zone 7b and warmer. Disease susceptibility: susceptible to blackspot , susceptible to Mildew. Spring Pruning: Remove old canes and dead or diseased wood and cut back canes that cross. In warmer climates, cut back the remaining canes by about one-third. In colder areas, you'll probably find you'll have to prune a little more than that. Requires spring freeze protection (see glossary - Spring freeze protection) .