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Managing Himalayan blackberry in western Oregon riparian

Managing Himalayan blackberry in western Oregon riparian 2025

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The thesis by David L. Hays investigates the physiological responses of Himalayan blackberry (Rubus armeniacus) to flooding and its implications for wetland restoration in the Pacific Northwest. Through greenhouse and laboratory experiments, the study reveals that R. armeniacus exhibits high tolerance to anoxic conditions, with significant morphological adaptations such as adventitious root growth and hypertrophic stem swelling under flooding stress. The findings suggest that while flooding alone is insufficient for controlling this invasive species, combining it with mechanical cutting and shading may enhance restoration efforts in infested wetlands.

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How deep are Himalayan blackberry roots?

The root crown on Himalayan blackberry, from which many lateral roots grow at various angles, can be up to eight inches (20 cm) in diameter. One root had a maximum depth of almost 3 feet (90 cm) and was more than thirty-three feet (10 m) long (Northcroft 1927).

What is the root system of a Himalayan blackberry?

A large quantity of hard and dry litter and standing dead canes accumu- late in old thickets (photograph 7). The root crown on HBB can be up to 20 cm (8 inches) in diameter (photographs 8 and 9), from which many lateral roots grow. Roots have been recorded to a maximum depth of 90 cm (35 inches), and 10 m in length.

Do blackberries have deep roots?

Heres the most effective way to permanently get rid of invasive Himalayan blackberry. Essentially you cut the plants down to the base, and dab each cut with Stump and Vine Killer by Bonide. This soaks in to the roots and kills the blackberry plant, but doesnt the surrounding vegetation.

Is Himalayan blackberry invasive in Oregon?

Himalayan/Armenian blackberry is the most widespread and disruptive of all the noxious weeds in Western Oregon. It displaces native species, dominates riparian habitats, and costs millions of dollars to control in parks, right-of-ways, forests and agricultural areas.

When to spray blackberries in Oregon?

blackberry is mowed or cut midsummer, allowed to grow back to 18 inches, then sprayed in fall with glyphosate or triclopyr. 2. Or, the area first is sprayed in fall and is mowed, cut, or burned in late fall or the following season.

How do you control Himalayan blackberries in the Pacific Northwest?

Control can be achieved by cutting the canes down to the ground. The roots can not withstand the anaerobic soil conditions without the supporting canes. blackberries remaining outside the mowed area will quickly re-invade the cleared areas. Spot spray blackberries with glyphosate in areas with no desirable vegetation.

How far down do blackberry roots go?

How deep do blackberry roots grow? Blackberry plant roots grow 12 inches in depth. Blackberry bushes are spread by both root rhizome and by seeds from the blackberry fruit. A physical plastic barrier that is 18 inches in depth can better prevent these roots from spreading.

Managing Himalayan blackberry in western Oregon riparian 2025

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