Practical
Plants

Rosa pisocarpa

Cluster Rose

a perennial woody deciduous member of the Rosa genus in the family Rosaceae.

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Taxonomy and growth

Family
Rosaceae
Genus
Rosa
Life cycle
perennial
Foliage
deciduous
Woodiness
woody
Height
2.5 m
Fertility
Bees
Flower type
hermaphrodite
Pollinators
Bees

Uses

Toxicity

Toxicity warning. The historical record reports a hazard for this plant. Do not use it to decide which parts are safe to eat or use medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

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.

Edible uses

This section contains historical Plants For A Future notes marked noncommercial.

Fruit - raw or cooked[3][6]. It is used to make jams and jellies, it is also used to make a pleasant tasting fruity-flavoured tea[4][6]. The fruit is about 13mm in diameter[8], but there is only a thin layer of flesh surrounding the many seeds[K]. Some care has to be taken when eating this fruit, see the notes above on known hazards. The seed is a good source of vitamin E, it can be ground into a powder and mixed with flour or added to other foods as a supplement[1][6]. Be sure to remove the seed hairs[1]. The shoots can be used to make a tea-like beverage[10]. Young tender shoots - peeled and eaten in the spring[10].

Plant part
Fruit
Plant part
Seed
Plant part
Stem
Product or use
Tea

Medicinal uses

Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

A decoction of the roots has been used in the treatment of sore throats and syphilis[10]. An infusion of the bark has been taken by a mother just after childbirth[10]. A decoction of the branches, combined with chokecherry (Prunus virginiana) and red willow (Salix bonplandiana), has been used in the treatment of various women's complaints, diarrhoea and vomiting[10]. The leaves have been placed in the shoes as a protection from athletes foot[10]. 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[9].

Product or use
Astringent
Product or use
Cancer
Product or use
Foot care
Product or use
VD
Product or use
Women's complaints

Environment

Range
Western N. America - British Columbia to California.
Habitat
Shaded slopes below 1500 metres in California.
Light
full sun
Shade tolerance
light shade
Water
moderate
Hardiness
Zone 6+
Soil textures
sandy, loamy, clay, heavy clay
Soil pH
acid, neutral, alkaline
Drainage
well drained
Tolerates Nutritionally Poor Soil
No
Drought
intolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

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[12]. 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[12]. 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[12]. 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[8]. It may take 2 years to germinate[8]. 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[11]. High percentage[11]. 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[11][8]. The cuttings can take 12 months to establish but a high percentage of them normally succeed[11]. Division of suckers in the dormant season. Plant them out direct into their permanent positions. Layering. Takes 12 months[2].

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

Succeeds in most soils[2], preferring a circumneutral soil and a sunny position[8]. Grows well in heavy clay soils. Dislikes water-logged soils[8]. Grows well with alliums, parsley, mignonette and lupins[5][7]. Garlic planted nearby can help protect the plant from disease and insect predation[5][7]. Grows badly with boxwood[5]. Hybridizes freely with other members of this genus[12]. Plants in this genus are notably susceptible to honey fungus[8].

References

  1. Kavasch. B. Native Harvests. Vintage Books 1979-00-00 ISBN 0-394-72811-4

    ↩1↩2

  2. Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981-00-00

    ↩1↩2

  3. Gunther. E. Ethnobotany of Western Washington. University of Washington Press 1981-00-00 ISBN 0-295-95258-X

    ↩

  4. Kunkel. G. Plants for Human Consumption. Koeltz Scientific Books 1984-00-00 ISBN 3874292169

    ↩

  5. Philbrick H. and Gregg R. B. Companion Plants. Watkins 1979-00-00

    ↩1↩2↩3

  6. Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990-00-00 ISBN 0-9628087-0-9

    ↩1↩2↩3

  7. Riotte. L. Companion Planting for Successful Gardening. Garden Way, Vermont, USA. 1978-00-00 ISBN 0-88266-064-0

    ↩1↩2

  8. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩1↩2↩3↩4↩5↩6↩7

  9. Matthews. V. The New Plantsman. Volume 1, 1994. Royal Horticultural Society 1994-00-00 ISBN 1352-4186

    ↩

  10. Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998-00-00 ISBN 0-88192-453-9

    ↩1↩2↩3↩4↩5↩6

  11. Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948-00-00

    ↩1↩2↩3↩4

  12. McMillan-Browse. P. Hardy Woody Plants from Seed. Grower Books 1985-00-00 ISBN 0-901361-21-6

    ↩1↩2↩3↩4

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