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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

More Contact Info

Required Eradication List

Required Plant Eradication List

Requirements took effect July 1, 2010

Fact Sheet

Summary of requirements

1. Russian Knapweed

Acroptilon repens

2. False Brome

Brachypodium sylvaticum

3. Italian Thistle or Slender Flowered Thistle

Carduus pycnocephalus and Carduus tenuiflorus

4. Jubata grass

Cortaderia jubata

5. Paterson's Curse

Echium plantagineum

6. Giant Hogweed

Heracleum mantegazzianum

7. Orange Hawkweed

Hieracium aurantiacum

8. Meadow Hawkweed (formerly listed as Yellow Hawkweed)

Hieracium pratense (h. cespitosum)

9. Policeman's Helmet

Impatiens glandulifera

10. Scotch Thistle

Onopordum acanthium

11. Common Reed

Phragmites australis (introduced variation only)

12. Kudzu

Pueraria lobata

13. Blessed Milk Thistle

Silybum marianum

14. Saltcedar

Tamarix ramosissima

15. Gorse

Ulex europaeus