Rosa gymnocarpa Nutt.
Rosa gymnocarpa, commonly known as wood rose, is a shrub.
The comparatively long-lived shrubs reach heights of 90 centimetres, they have a semi-erect habit and produce multiple stems. The main growing season is in spring and summer.
Wood and Bark
Rosa gymnocarpa is deciduous. The dark-green, imparipinnate leaves are alternate. The elliptic leaflets are serrate and petiolate.
Flowers and Fruits
Rosa gymnocarpa produces showy purple five-stellate flowers from June to July.
From summer to autumn the shrubs produce ornamental red hips that are persistent on the plant.
Rosa gymnocarpa is native to British Columbia, the Northwest of the US, the Rocky Mountains and California.
The shrubs prefer a sunny to half-shady situation on dry to moderately moist soil. They prefer sandy-loamy or gritty-loamy soil with a pH between 6 and 7,8. The plants need a soil depth of at least 36 centimetres for good growth. They tolerate temperatures down to -18Â°C (USDA zone 7) and need a frost-free period of at least 20 weeks.
Tolerance of special soil conditions
- none: soil salinity, anaerobic soil
- medium: drought, calcareous soil
The ornamental value of Rosa gymnocarpa lies especially in the attractive autumn aspect and its fragrance. The recommended planting distance is 1,5 to 2,4 metres. Suited for rockeries.
Maintenance and Propagation
Propagate by sowing. The seeds require vernalization. Also by cuttings.
Pests and Diseases
- Walter Erhardt, Erich GÃ¶tz, Nils BÃ¶deker, Siegmund Seybold: Der groÃe Zander. Eugen Ulmer KG, Stuttgart 2008, ISBN 978-3-8001-5406-7. (Ger.)
- Christoper Brickell (Editor-in-chief): RHS A-Z Encyclopedia of Garden Plants. Third edition. Dorling Kindersley, London 2003, ISBN 0-7513-3738-2.