In order to plant in the gardening strip, a Street Use permit is required. But, as long as it meets guidelines, the permit is free!

They recommend including native and drought-tolerant plants and provide a plant list. Food plants allowed. Raised beds within restrictions.

See more details and photos at: https://www.seattle.gov/transportation/permits-and-services/permits/planting-in-the-right-of-way

See also parking strip vegetable gardening from University of Washington Botanic Gardens which links to the following pdf documents.

• City of Seattle’s guidelines for parking strip gardening
• Seattle Department of Transportation specific information about growing food in the planting or parking strip