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Pacific Northwest Research Station
Blue Mountains National Resources Institute

Forestry and Range Sciences Laboratory
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La Grande, OR 97850

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BMNRI Home > Publications > Weeds > Perennial Pepperweed


Publications: Noxious Weeds

Explosion in Slow Motion: A talk by Jerry Asher about noxious weeds in the Blue Mountains


Click on a weed to learn about how to find it and kill it!


Common Crupina
Diffuse Knapweed
Russian Knapweed
Spotted Knapweed
Purple Loosestrife
Perennial Pepperweed
Puncturevine
Tansy Ragwort
Medusahead Rye
Rush Skeletonweed
Yellow Starthistle
Canada Thistle
Musk Thistle
Scotch Thistle
Dalmatian Toadflax
Mediterranean Sage
St. Johnswort
Leafy Spurge
Whitetop
Dyers Woad

Wanted: DEAD!

Perennial Pepperweed

Alias: Broad-leafed peppergrass, tall whitetop, Virginia pepperweed

  • Stems: Up to 6 feet high
  • Leaves: 12 inches long, bright green to gray-green, leathery, toothed to entire. Lower leaves taper to a stalk, upper leaves reduced in size and sessile, but not clasping. Leaves have prominent whitish midvein.
  • Flowers: Borne in large dense masses; four sepals and petals, white, about 1/16-inch long, rounded in outline and flattened, bearing a few hairs. Flowering period from June to September.
  • Seeds: Contained in light reddish-brown fruits, minutely roughened. Two seeds per fruit.

Perennial pepperweed spreads both from a widely spreading root system and from seed. It is often found growing in wet areas along roadsides and ditches. It can invade cropland. It is extremely difficult to control because of the extensive root system.


Control: Consult with you local weed control office for information about stopping the spread of this weed.


Report all sightings to your local Weed Board

US Forest Service - Pacific Northwest Research Station, Blue Mountains National Resources Institute
Last Modified: Monday, 16 December 2013 at 14:18:43 CST


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