Geranium ‘Gerwat’ PBR ROZANNE®

hardy geranium


  • © Richie Steffen / Great Plant Picks

  • © Richie Steffen / Great Plant Picks

Outstanding Qualities

Geranium 'Gerwat' ROZANNE is a relatively new but outstanding hardy geranium. It is noted for its long bloom time - from June until frost in some areas - producing many large, 2.5-inch, clear blue flowers with white centers. These rise above the leaves to about 15 inches high. The foliage of ROZANNE forms a tidy mound to about 10 inches high and 18 inches wide. Use it at the front of a perennial or mixed shrub border, over a large rock wall or between boulders. Grow it in a container with other perennials. Combine it with grasses, sedums, astrantias, and eryngiums.

Quick Facts

Plant Type: spreading perennial

Foliage Type: deciduous

Plant Height: 1 ft. 6 in. (0.46 meters)

Plant Width/Spread: 1 ft. 2 in. (0.37 meters)

Hardiness: USDA Zones 5 to 8

Flower Color: blue, white

Sun/Light Exposure: full sun

Water Requirements: regular watering during prolonged dry spells

Wildlife Associations: bees, butterflies

Colors & Combos

Great Color Contrasts: gold, orange, chartreuse, silver

Great Color Partners: pink, purple, white

Culture Notes
This hardy geranium prefers full sun but tolerates light or open shade with rich moist to well-drained soils. For the longest flowering and best bloom provide regular watering during prolonged dry spells. Cut it to the ground in late fall or early winter. This vigorous grower can be divided every three to four years in late winter to early spring.
Geek Notes
This hybrid geranium was discovered in 1990 by George and Rozanne Waterer of Somerset, England in their garden. The seed parent was Geranium wallichianum 'Buxtons Variety' and the pollen parent was possibly an unnamed cultivar of Geranium himalayense. In 2000 Blooms of Bressingham, a commercial horticultural company in the UK, introduced Geranium ROZANNEĀ® and the Perennial Plant Association declared it the 2008 Plant of the Year. While typically known by its trademark name, ROZANNEĀ®, its cultivar name, 'Gerwat', is used for the US Plant Patent and the Plant Breeders Rights (PBR) in Europe. The first part of the cultivar name, "Ger," comes from the first three letters of geranium while the last three letters were taken from originator's name, Waterer.