Himalayan blackberry

Rubus armeniacus

   

Family: Rosaceae

Other scientific names: Rubus discolor, Rubus procerus

Weed Class: C

Year Listed: 2009

Native to: Asia

Toxic: not known to be

Other Legal Listings:

additional photos

 

   

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?

General Description: 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 Description: 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.

Leaf Description: Leaves are alternately arranged on stems. Each leaf is palmately compound and made up of 3 to 5 (typically 5) leaflets with toothed margins

Stem Description: 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.

May be confused with:

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.
 

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 do I control it?

Mechanical Control

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.

Cultural Control

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Biological Control

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.

Herbicide Control

Please refer to the PNW Weed Management Handbook, or contact your county noxious weed coordinator.


 

For more information

 
See our Written Findings for more information about Himalayan blackberry (Rubus armeniacus).

Additional Photos


 
 

 


Himalayan blackberry with fruit

 


Himalayan blackberry infestation

 


Himalayan blackberry stems

 


Himalayan blackberry flower

 


Compound leaf made up of 5 leaflets

 


Underside of 1 leaflet

 


Immature fruit

 


stem tip growing roots

 


ripe fruit

    

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