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Perennial of the Geraniaceae family, Geranium wallichianum is native to the foothills of the Himalayas, northern India, and Pakistan, where it grows in high-altitude meadows, forest edges, and grassy slopes between 2,000 and 3,500 meters. 'Rozanne' is a cultivar selected in England in the late 1990s, resulting from a spontaneous seedling noticed in the garden of Rozanne and Donald Waterer.
The plant forms spreading clumps and ground cover, with flexible, creeping stems that can extend 60 to 90 cm, for a modest height of 30 to 40 cm. The foliage is palmately lobed, a bright green, often marked with diffuse silver spots between the veins, giving it a slightly marbled appearance.
The generous flowers reach about 4 cm in diameter. Their five petals are a bright blue-violet, lightening towards a white center veined with purple, with stamens bearing prominently visible dark anthers. The color can vary from lavender blue to violet depending on the light and conditions.
In its natural habitat, the species blooms from July to September. In cultivation, 'Rozanne' is remarkable for an exceptionally long flowering period, from June until the first frosts, without notable interruption.
It adapts to most well-drained soils, in full sun or partial shade, and tolerates periods of moderate drought once well established. Its vigor and long flowering period make it one of the most used perennial geraniums for ground cover or cascading over walls.