• Olympic: Three Parks in One

    Olympic

    National Park Washington

There are park alerts in effect.
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  • Madison Falls Trail Closed for Repairs Beginning July 7

    The one-tenth mile Madison Falls Trail and trailhead parking lot located in Elwha Valley will close to public entry beginning on Monday, July 7 while crews make improvements and repairs.

  • Spruce Railroad Trail Improvements to Begin August 5

    Spruce Railroad Trail will be closed from the Lyre River TH to approximately 0.25 miles east of Devil’s Punchbowl. Work is expected to be completed by the end of October. The remainder of the trail will be accessible from the Camp David Jr. Road TH. More »

  • Safety Advisory: Mountain Goats

    NPS has received reports of aggressive mountain goats near trails at Hurricane Ridge, Royal Basin, Seven Lakes Basin, Lake of the Angeles, & Grand Pass. Visitors are required to maintain a distance of at least 50 yards from all wildlife. More »

  • Safety Advisory: Rabies

    Rabies has been detected in a single bat in the Lake Crescent area of the park. Rabies exposure is extremely rare, but fatal if untreated. Anyone observing unusual or aggressive behavior among park wildlife should inform a park ranger as soon as possible. More »

Himalayan Blackberry

Himalayan Blackberry

Himalayan blackberry has five-petaled flowers
and pointed-oval leaves

NPS photo by Will Elder

Rubus discolor

These nonnative vines are well known for both their food value and their aggressive growth. Himalayan blackberry spreads over other plants or buildings and can form dense, thorny thickets. Native blackberries also grow in this region, but they are a much rarer sight.

Identification:

Himalayan blackberry is a mostly evergreen perennial with nearly erect stems that clamber and sprawl when they grow long; they can reach up to 35 feet in length. Stems have strong, broad-based spines that hold on tenaciously and older stems are five-angled. Leaves usually have five oval leaflets, bright green above and gray to white beneath. Small flowers are white to pinkish. The fruit is a juicy, edible blackberry up to half an inch thick and is the most common wild blackberry harvested in western Washington.

 
Evergreen Blackberry

Evergreen blackberry
Note the very divided leaves

Jefferson County
Weed Control Board

Look-a-likes:

These other blackberry species are less abundant than Himalayan blackberry.

  • Evergreen blackberry (Rubus laciniatus) is also a problematic invasive plant. Leaves are usually made up of 5 very divided and toothed leaflets.
  • The native blackberries generally have weaker vines and tend to crawl along the ground.

How is it spreading and where?

Himalayan blackberry was introduced from Eurasia. It often spreads over the top of other plants and crushes or smothers them. It can root at branch tips and spread from roots (suckers). Birds can spread the berries over long distances. It is a Class C weed in Washington State, which means it is already widespread.

In Olympic National Park, it is found in some lowland areas, usually where the soil has been disturbed.

 
Himalayan Blackberry

Himalayan blackberry vines with five-part leaves and ripe and unripe berries.

Jefferson County Weed Countrol Board

Control in Olympic:

Small patches of blackberry are trimmed above the ground and then all roots pulled out. Another control option is frequent mowing. Herbicides are also used.

For more information, see Weed Resources.

Back to Invasive Plants

Did You Know?

Mossy trees in the Hoh Rainforest

...that one criterion for the determination of a temperate rain forest is that the amount of moss and other epiphytes exceeds the weight of all the foliage (leaves and needles) per acre by at least two times.