Rose Rosier a feuilles rougeâtres

Rosa glauca (Rosa rubrifolia), commonly known as the blue (glaucous) rose or red-leaf rose, is a species of wild rose native to the mountainous regions of central and southern Europe, from the Spanish Pyrenees eastward to Bulgaria and northward to Germany and Poland. It has been naturalized in northern Europe beyond its native range and can also be found as an introduced species in Scandinavia and Finland. There is some confusion regarding the correct name for this species. Its most common name, R. rubrifolia, is invalid, so R. glauca is used instead. It hybridizes freely with other species of the genus.

This rose forms a large, sprawling, upright shrub that reaches 150 – 350 cm in height and about 150 cm in width. The branches are cinnamon-colored, sparsely bristled, and prickly, with arching branches. The foliage is distinctive, matte, and ranges from grayish-blue-green to copper-red or purple, covered with a waxy bloom. Leaves consist of 5–9 leaflets, 5–10 cm long.

The flowers are small (2.5–4 cm), single (4–8 petals), and very delicate, with translucent pink petals and a white center. They emerge from contrasting dark buds and appear in clusters of 2–5 flowers. The flowers have a pleasant, moderate fragrance and bloom once in spring or summer. After flowering, dark red, spherical hips (10–15 mm in diameter) are produced, with seeds maturing from August to October. The species is hermaphroditic (having both male and female organs) and is pollinated by bees.

This rose was not widely cultivated in gardens until the late 19th century. The petals are easily shed by splashes from sprinklers, as well as by wind and rain. Today, it is valued by gardeners and florists for its beautiful copper-lilac foliage throughout the season, small pink flowers that contrast attractively with the leaves, and appealing dark red hips in winter.

Characteristics

 Growth habit: Vigorous and shade-tolerant.

 Disease resistance: Very resistant to diseases.

 Hardiness: Extremely frost-hardy (climates zones similar to USDA Zone 2b–9b).

 Preferred conditions: Thrives in light (sandy), medium (loamy), and heavy (clay) soils that are well-drained. It tolerates moderately acidic, neutral, and moderately alkaline pH levels.

Can grow in partial shade (light woodland) or full sun. Prefers neutral soil but adapts well to various soil types, including heavy clay. Dislikes waterlogged soils.

Grows well alongside onions, parsley, mignonette, and lupines. Garlic planted nearby can help protect the plant from diseases and pests. Does not grow well near boxwood.

The Latin name Rosa glauca translates to "blue rose," referring to the gray-blue colour of its foliage.

This plant has received the Royal Horticultural Society's Award of Garden Merit for its exceptional qualities.

Information about the parantage of this rose is not available or commecrically protected.

USDA 3 and warmer