Multnomah County actively encourages native plant landscaping through the East Multnomah Soil and Water Conservation District. Portland Title 11 Trees and the Stormwater Management Manual require native or adapted species for certain applications. Oregon's xeriscape preemption under HB 2571 (2023) prohibits HOA bans on native plant landscapes.
Multnomah County does not mandate native plant landscaping, but the East Multnomah Soil and Water Conservation District (EMSWCD) runs a Native Plant Sale, provides landscape assistance, and offers the Backyard Habitat Certification Program in partnership with Portland Audubon. Portland City Code Title 11 (Trees) and the Stormwater Management Manual (SWMM) require use of native or adapted species for street trees, green street facilities, and private stormwater facilities (rain gardens, bioswales, ecoroofs). Portland's street tree list PCC 11.50.040 includes Pacific madrone, Oregon white oak, vine maple, and Douglas fir among preferred natives. Oregon's House Bill 2571 (2023) codified at ORS 94.776 prohibits HOAs from banning xeriscaping, drought-resistant landscaping, synthetic turf, or native plant gardens, with limited reasonable aesthetic restrictions. Oregon Department of Agriculture noxious weed program ODA-403 lists invasives like English ivy (class B), Armenian blackberry, and garlic mustard that may be required for removal. Metro Regional Government offers Nature in Neighborhoods grants for native plant restoration. Multnomah County's Climate Action Plan encourages pollinator gardens and references Oregon State University Extension native plant guides. Private wells and septic systems within 100 feet of riparian areas have additional native vegetation buffer requirements under Oregon DEQ rules OAR 340-071.
No direct penalties for using natives. HOA bans on natives are unenforceable under ORS 94.776. Invasive species violations: ODA enforcement and property-owner removal at cost. Non-compliant stormwater plantings: Portland BES correction order.
Gresham, OR
Gresham addresses barking dogs through noise and animal control ordinances. Persistent barking that disturbs neighbors is a violation enforceable through Cod...
Gresham, OR
Gresham permits construction activities between 7 AM and 10 PM per GRC §7.20. Construction noise outside these hours is prohibited in residential areas.
Gresham, OR
Gresham Revised Code §7.20 regulates noise. Residential areas must not exceed 50 dBA between 10 PM and 7 AM, or 60 dBA between 7 AM and 10 PM at the property...
Gresham, OR
Gresham regulates on-street parking with time limits in certain areas. Vehicles must be currently registered and operable. Abandoned vehicles are subject to ...
Gresham, OR
Gresham requires driveways to meet development code standards. Vehicles must not block sidewalks or extend into the public right-of-way. Driveway modificatio...
Gresham, OR
Gresham restricts commercial vehicle parking in residential zones. Large commercial vehicles and heavy equipment may not be stored in residential areas.
Side-by-side rule comparisons with other cities in Multnomah County.
See how Gresham's native plants rules stack up against other locations.
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