Japanese Rose

Rosa rugosa

Overview

Photo credit: ©A.R. Pittaway
Japanese Rose - Rosa rugosa
Description:
  • It is a rhizomatous multi-stemmed deciduous shrub, with prickles present on the stems. Large elliptical leaves alternate along branches. Fragrant purple-pink or white flowers occur in single flowers or few flowers together; flowers are nectarless. Dull green hips ripen to glossy and brilliant red.
  • Download N.I.E.A. ID Guide

Origin and Worldwide Distribution:
  • It is native to East Asia, from the Russian Far East to northern Japan, North Korea, Doth Korea and north-eastern China.
  • Across the world, it is found in Austria, Belarus, Belgium, Bulgaria, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Latvia, the Netherlands, Norway, Canada, the United States, Australia and New Zealand.

Potential or Known Impacts:
  • It has been seen that it can alter soil nutrition, by increasing potassium, manganese and nitrogen. This alters the species abundance and numbers surrounding it to minimal native species.
  • If growing in coastal environments, it can start or alter the formation of dunes.
  • It can form thick monocultures, which can cause problems for landowners and the public as they are difficult to control, especially as they can coppice if cut.

How did it get here?
  • It was introduced as an ornamental species, or as a rootstock for other roses or as a hybrid. Its rhizomes can break off and can spread by water to new areas.
  • The hips from this species have been known to float for up to 42 weeks, in freshwater and seawater! The seeds are still viable after being exposed to inhospitable conditions after that amount of time.

Is it found in Ireland or Northern Ireland?
  • It is found in Ireland and Northern Ireland.

You can help by reporting any sightings:
Methods for Prevention:
  • Grazing by goats is possible in an areas where this type of grazing has been done before. If done incorrectly, grazing can trigger heavy regrowth.
  • Physical removal of the entire plant is recommended in both large scale and small scale infested areas.
  • Herbicide is effective if repeated after cutting or mowing this species. Weed-wiping, using a brush or using a knapsack helps to direct the herbicide to the targeted species.
  • Spreading information regarding the invasiveness of this species can help in controlling its escape from gardens and private collections.
  • Report all sightings.

Species Related Files:

Invasive Species Ireland

Invasive Species Ireland