Weed class: C
Year Listed: 2009
Native to: Asia
Is this Weed Toxic?:
not known to be
Why Is It a Noxious Weed?
It is a notorious invasive species in many countries around the world and costs millions of dollars for both control and in estimated impacts. This species spreads aggressively and has severe negative impacts to native plants, wildlife and livestock.
How would I identify it?
It is a rambling evergreen, perennial, woody shrub with stout stems that possess stiff, hooked prickles. It may grow up to 13.1 feet. Plants grow into impenetrable thickets.
Flower clusters (panicles) are flat-topped and have 5 to 20 flowers. Each flower has 5 petals that are white to rose colored and about 1 inch in diameter.
Leaves are alternately arranged on stems. Each leaf is palmately compound and made up of 3 to 5 (typically 5) leaflets with toothed margins
Stems, commonly called canes, can reach up to 20 to 40 feet and can root at their tips when they touch the ground. Canes have hooked, sharp prickles with wide bases. They made dense thickets that are impassable and sprawl over the surrounding vegetation.
Fruit Seed Description
Flowers form blackberries—a grouping of small, shiny, black druplets that each contain one seed. Blackberries are about 1/2 inch to 7/8 inch in size.
Where does it grow?
It can grow in mixed and deciduous forests and a variety of disturbed sites such as roadsides, railroad tracks, logged lands, field margins and riparian areas. It does well in a wide range of soil pH and textures. Please click here to see a county level distribution map of Himalayan blackberry in Washington.
How Does it Reproduce?
It can reproduce by seeds and also vegetatively. Flowers can produce seeds with and without fertilization. It can vegetatively reproduce by re-sprouting rootstalks, rooting stem tips and root and stem fragments.
How Do I Control It?
Mechanical control methods include: 1.repeatedly digging out root crowns and large roots 2. repeated removal of above ground growth several times a year 3. burning the plants and returning for follow up control as plants will not be completely controlled with fire.
Success has been noted from grazing, especially by goats, yet sheep, cattle and horses may also be effective. This method seems to control the population from spreading and becoming larger rather than eradicating the plants from the site.
For More Information
See our Written Findings for more information about Himalayan blackberry (Rubus armeniacus).
Whatcom County NWCB Fact Sheet on Himalayan Blackberry
Mason County NWCB Fact Sheet on Himalayan Blackberry
Cowlitz County NWCB Fact Sheet on invasive blackberries
Jefferson County NWCB Fact Sheet on invasive blackberries
Whatcom County NWCB Fact Sheet on invasive blackberries
Asotin County NWCB Fact Sheet on invasive blackberries
Clark County NWCB Fact Sheet on invasive blackberries
King County NWCB Fact Sheet on invasive blackberries