ORS 633.738: Prohibition of local laws to inhibit or prevent production or use of seeds or products of seeds.

(1) As used in this section:

      (a) “Local government” has the meaning given that term in ORS 174.116.

      (b) “Nursery seed” means any propagant of nursery stock as defined in ORS 571.005.

      (2) Except as provided in subsection (3) of this section, a local government may not enact or enforce a local law or measure, including but not limited to an ordinance, regulation, control area or quarantine, to inhibit or prevent the production or use of agricultural seed, flower seed, nursery seed or vegetable seed or products of agricultural seed, flower seed, nursery seed or vegetable seed. The prohibition imposed by this subsection includes, but is not limited to, any local laws or measures for regulating the display, distribution, growing, harvesting, labeling, marketing, mixing, notification of use, planting, possession, processing, registration, storage, transportation or use of agricultural seed, flower seed, nursery seed or vegetable seed or products of agricultural seed, flower seed, nursery seed or vegetable seed.

      (3) Subsection (2) of this section does not prohibit a local government from enacting or enforcing a local law or measure to inhibit or prevent the production or use of agricultural seed, flower seed, nursery seed or vegetable seed or products of agricultural seed, flower seed, nursery seed or vegetable seed on property owned by the local government.