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The Northern Latitude Plant Materials Center is open by appointments only. Please call 907-745-4469 for further information.

Invasive Plants and Agricultural Pest Management

Welcome to Alaska's Invasive Plant Program. Our program coordinates prevention, outreach and management strategies for invasive plant issues through collaboration with land managers, agencies, organizations and policy makers across Alaska. These efforts are guided by the implementation of our Strategic Plan and relevant noxious weed regulations and policies. Our goal is to help keep Alaska's pristine landscapes and natural resources free from impacts of noxious and invasive plants.

PMC Programs


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5310 S Bodenburg Spur
Palmer, AK 99645
Phone: 907-745-4469
Fax: 907-746-1568

Mon. - Fri.
8 a.m. - 4 p.m.

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Prohibited & Restricted Noxious Weeds

(A) The following are prohibited noxious weeds:
  • Field Bindweed (Convolvulus arvensis)
  • Austrian Fieldcress (Rorippa austriaca)
  • Galensoga (Galensoga parviflora)
  • Hempnettle (Galeopsis tetrahit)
  • Horsenettle (Solanum carolinense)
  • Russian Knapweed (Acroptilon repens)
  • Blue-flowering Lettuce (Lactuca pulchella)
  • Quackgrass (Elymus repens)
  • Perennial Sowthistle (Sonchus arvensis)
  • Leafy Spurge (Euphorbia esula)
  • Canada Thistle (Cirsium arvense)
  • Whitetops and its varieties (Cardaria draba, C. pubescens, Lapidium latifolium)
  • Purple Loosestrife (Lythrum salicaria)
  • Orange Hawkweed (Hieracium aurantiacum)


(B) The following are restricted noxious weeds, with their maximum allowable tolerances:
  • Annual Bluegrass (Poa annua), 90 seeds per pound
  • Blue Burr (Lappula echinata), 18 seeds per pound
  • Mustard (Brassica juncea, Sinapis arvensis), 36 seeds per pound
  • Wild Oats (Avena fatua), seven seeds per pound
  • Buckhorn Plantain (Plantago sp.), 90 seeds per pound
  • Radish (Raphanus raphanistrum), 27 seeds per pound
  • Yellow Toadflax (Linaria vulgaris), one seed per pound
  • Tufted Vetch (Vicia cracca), two seeds per pound
  • Wild Buckwheat (Polygonum convolvulus), two seeds per pound

Authority:   AS 03.05 010
AS 03.05.030
AS 44.37.030
11AAC 34.020
(In effect before 7/28/59; am 3/2/78, Reg. 65; am 10/28/83, Reg. 88)

Prohibited and Restricted Noxious Weeds - download list in PDF format