Weed Ordinances: Gresham vs Troutdale
How do weed ordinances rules compare between Gresham, OR and Troutdale, OR?
Gresham and Troutdale have similar restriction levels.
Gresham, OR
Multnomah County
Multnomah County enforces noxious weed abatement under ORS 105.550 to 105.570 and Oregon Department of Agriculture OAR 603-052. Portland City Code 29.20 requires property owners to remove tall grass and noxious weeds over 10 inches. Armenian blackberry, English ivy, knotweed, and garlic mustard are priority invasives. The Portland Bureau of Development Services Nuisance Inspection Team handles complaints.
View full Gresham rules →Troutdale, OR
Multnomah County
Troutdale maintains an official Nuisance Plants list (40+ species removable without environmental review) and a Prohibited Plants list (Scot's Broom, English Ivy, Purple Loosestrife, Reed Canarygrass, Himalayan Blackberry) banned from all reviewed landscaping. Persistent infestations are abated under TMC Chapter 8.28.
View full Troutdale rules →Key Facts Comparison
| Fact | Gresham | Troutdale |
|---|---|---|
| Portland Limit | 10 inches grass/weeds | - |
| Authority | PCC 29.20; ORS 105.550 | - |
| Priority Weeds | Blackberry, ivy, knotweed | - |
| Enforcer | Portland BDS Nuisance Team | - |
| Cost | Owner pays + lien | - |
| Nuisance Species | - | 40+ listed |
| Prohibited Species | - | 5 (incl. English Ivy) |
| Removal Review | - | Waived for nuisance list |
| Enforcement | - | TMC Ch. 8.28 |
Highlighted rows indicate differences between cities.
Gresham FAQ
How tall can my grass be in Portland before I get cited?
PCC 29.20 requires visible grass and weeds to be kept under 10 inches. Taller is allowed only for intentional native meadow, food gardens, or erosion-control plantings.
What if my neighbor has out-of-control blackberry?
File a nuisance complaint with Portland BDS (portland.gov/bds/nuisance) or Multnomah County Code Compliance for unincorporated areas. Himalayan blackberry is a priority invasive.
Troutdale FAQ
Can I plant English Ivy in my Troutdale yard?
Not in any reviewed landscaping plan. The city's Prohibited Plants list bans Hedera helix and all sub-species and cultivars, along with Scot's Broom, Purple Loosestrife, Reed Canarygrass, and Himalayan Blackberry.
Do I need permission to remove invasive blackberries or English holly?
No. Both Himalayan blackberry, evergreen blackberry, and English holly are on Troutdale's Nuisance Plants list and may be removed without environmental or greenway review.
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