Japanese rose – Rosa rugosa
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- Invasive alien species
Description
Japanese rose is a 0,5 to 1,5 metres tall shrub with large pink or sometimes white flowers. The surface of the leaves is wrinkled, from which the plant gets its Finnish name, “wrinkled rose”. In Finland, it can be seen as an ornamental plant in various plantings and on roadsides as well as an escapee in the environment, especially on the coastal areas.
The species reproduces from seeds and it also spreads vegetatively through rootstocks in its wide root system. Usually, the seeds do not germinate in the same autumn because of dormancy, which needs to be broken by cold stratification. However, to prevent its spreading from gardens to nature, it is worth collecting rose hips in the autumn. This reduces both the risk that birds will spread seeds and that fallen seeds will germinate in spring. It is worthwhile to collect the rose hips of Rosa Rugosa -varieties as well, because there is variation even in their seed production.
Growing form
A deciduous shrub that forms extensive stands via root sprouts.
Size
30–120 cm high.
Stem
The leaf arrangement is spiral. The leaves are stipulate. The lamina is imparipinnate with 5–9 leaflets. The leaflets are thick, rugose, densely pubescent beneath and serrate.
Leaf
The flowers are bisexual and solitary, paired or in groups of three. The pedicel is covered with glandular hairs. The sepals are entire, covered with glandular hairs, erect and persistent after flowering. The corolla is 6–10 cm wide, typically with five petals and red or white.
Root
The stem is lignified and branched. The branches are stout and ascending – erect. The stem and branches are densely pubescent and densely prickly. The prickles are straight and the size varies.
Flower
Flowers from midsummer to early autumn (VI–IX).
Fruit and seed
The heps (2–2.5 cm) are turnip-shaped, glabrous and red.
The map represents observations of this taxon, but it may not be used as a distribution map.
- Total squares
- kurtturuusu (Finnish)
- vresros (Swedish)
- Japanese rose (English)
- TNV - alien, new, resident
- 3 - spreading in the wild; completely of cultivated origin
Establishment | Established |
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Finland’s National Strategy on Invasive Alien Species (GR 2012) ? Government Decree on Managing the Risk Caused by Alien Species (704/2019, VN 912/2023) ?
- 2019 NA – Not Applicable
- 2010 NA – Not Applicable
- Arto Kurtto
- Vascular plants