Common Name: Red-Leafed Rose

General Information

Rosa glauca is an erect, prickly, deciduous shrub growing from a rhizomatous rootstock; it produces a cluster of sparsely branched, more or less flexuous stems that can grow up to 2.5 metres tall[].
The plant is harvested from the wild for local use as a food and medicine. It is often grown as an ornamental, where it is especially valued for its leaf colour, and can be used to make a prickly hedge.
Rosa glauca is sometimes cultivated as an ornamental[], and has often escaped from cultivation. As its garden cultivation increases, the species will continue to spread and become naturalized. The shrubs usually produce abundant hips and achenes as well as rhizomatous shoots; once established the plants reproduce vegetatively and sexually[].

Known Hazards

There is a layer of hairs around the seeds just beneath the flesh of the fruit. These hairs can cause irritation to the mouth and digestive tract if ingested.

Botanical References

, ,

Range

Europe - Montane regions from Spain, France and Germany, east to Greece, Ukraine and southern European Russia

Habitat

Mountains[]. Roadsides, wastelands, neglected areas; at elevations up to 2,000 metres[].

Properties

Weed Potential	Yes
Edibility Rating
Medicinal Rating
Other Uses Rating
Habit	Deciduous Shrub
Height	2.50 m
Pollinators	Bees
Cultivation Status	Ornamental, Wild

Cultivation Details

Rosa glauca is a very cold-hardy plant, being able to tolerate temperatures down to around -40°c when fully dormant[].
Most Rosa species require a sunny position if they are to flourish and flower well. They prefer a circumneutral pH, succeeding in a range of soil texturess so long as they are moist but well-drained[, ].
The plant usually fruits freely[].
Rose species will often hybridize freely with other members of the genus[].
Plants in this genus are notably susceptible to honey fungus[].

Edible Uses

Fruit - raw or cooked. Tough and without much flesh[]. The dark brownish red to crimson red, globose, ovoid, or obovoid, fruit is about 10 - 13mm × 9 - 11mm in diameter[, , ], but there is only a thin layer of flesh surrounding the many seeds[]. Some care has to be taken when eating this fruit, see the notes above on known hazards.

The seed of roses is generally a good source of vitamin E, it can be ground and mixed with flour or added to other foods as a supplement[, ]. Be sure to remove the seed hairs[].

Medicinal

The fruit of many members of this genus is a very rich source of vitamins and minerals, especially in vitamins A, C and E, flavanoids and other bio-active compounds. It is also a fairly good source of essential fatty acids, which is fairly unusual for a fruit. It is being investigated as a food that is capable of reducing the incidence of cancer and also as a means of halting or reversing the growth of cancers[].

Agroforestry Uses:

Plants can be grown as a hedge.
Rose species in general grow well with alliums, parsley, mignonette and lupins[, ]. Garlic planted nearby can help protect the plant from disease and insect predation[, ]. Roses often grow badly with boxwood[].

Other Uses

The plant is sometimes used as a rootstock for double-flowered forms of roses[].

Propagation

Seed. Rose seed often takes two years to germinate. This is because it may need a warm spell of weather after a cold spell in order to mature the embryo and reduce the seedcoat[]. One possible way to reduce this time is to scarify the seed and then place it for 2 - 3 weeks in damp peat at a temperature of 27 - 32°c (by which time the seed should have imbibed). It is then kept at 3°c for the next 4 months by which time it should be starting to germinate[]. Alternatively, it is possible that seed harvested 'green' (when it is fully developed but before it has dried on the plant) and sown immediately will germinate in the late winter. This method has not as yet(1988) been fully tested[]. Seed sown as soon as it is ripe in a cold frame sometimes germinates in spring though it may take 18 months. Stored seed can be sown as early in the year as possible and stratified for 6 weeks at 5°c[]. It may take 2 years to germinate[]. Prick out the seedlings into individual pots when they are large enough to handle. Plant out in the summer if the plants are more than 25cm tall, otherwise grow on in a cold frame for the winter and plant out in late spring.
Cuttings of half-ripe wood with a heel, July in a shaded frame. Overwinter the plants in the frame and plant out in late spring[]. High percentage[].
Cuttings of mature wood of the current seasons growth. Select pencil thick shoots in early autumn that are about 20 - 25cm long and plant them in a sheltered position outdoors or in a cold frame[, ]. The cuttings can take 12 months to establish but a high percentage of them normally succeed[].
Division of suckers in the dormant season. Plant them out direct into their permanent positions.
Layering. Takes 12 months[].