Invasive Plant Rules in Tigard, OR (2026)
1 verified invasive plant rules for Tigard, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
Prohibited Species
In the City of Tigard, Oregon, no responsible party can plant or allow to be planted on their property five named invasive and noxious plants: English ivy, giant hogweed, purple loosestrife, Japanese knotweed and Himalayan blackberry. The responsible party must remove or destroy them, and a violation is a Class 1 civil infraction.
Prohibited Invasive Plants in Tigard, Oregon
Significant RestrictionsTigard Municipal Code §§ 6.01.020, 6.02.020
8. Any of the following invasive and noxious plants: Hedera helix L. (English ivy), Heracleum mantegazzianum (giant hogweed), Lythrum salicaria L. (purple loosestrife), Polygonum cuspidatum (Japanese knotweed), Rubus discolor (Himalayan blackberry); ... C. No responsible party shall plant or allow to be planted on their property noxious vegetation as defined in Section 6.01.020.M.8. D. The resp...
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County ordinances apply to unincorporated areas and may supplement Tigard city rules.
Invasive Plant Rules in Washington County →