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Perennial of the Geraniaceae family, Geranium endressii is native to the western Pyrenees, where it occupies moist forest edges, shaded clearings, and roadsides, between approximately 400 and 1,800 meters. It thrives in fresh, humus-rich soils, in shade or partial shade.
It forms spreading and vigorous clumps, 30 to 45 cm in height, with semi-evergreen foliage of a bright, glossy green, cut into well-marked toothed lobes. The plant gradually spreads by stolons to form an effective and dense ground cover.
The flowers are a deep pink, slightly satin-like, with notched petals bearing fine darker veins. They sometimes lighten as they age to a paler pink. The stamens and style are clearly visible in the center.
In its natural habitat, its flowering extends from June to August. In cultivation, it can start as early as May and continue until September, especially if the plant is cut back after the first wave.
It adapts to a wide range of soils, tolerates dry shade better than many other geraniums, and is quite cold-resistant. Its vigor makes it an excellent ground cover for undergrowth and slopes, although it can become invasive in very favorable conditions.