The following are beautiful gardens right here in Oregon...enjoy!!
Hoyt Arboretum, 400 SW Fairview Blvd, Portland OR  97221  Specialties:  conifers, flowering trees, and shrubs
Japanese Garden Society of Portland, 611 SW Kingston Ave, Portland OR  97201  Specialty:  Japanese garden design
Leach Botanical Garden, 6704 SE 122nd Ave, Portland, OR  97236  Specialty:  Pacific Northwest natives
Mount Pisgah Arboretum, 33735 Seavey Loop Rd, Eugene, OR  97405  Specialty:  wildflowers of the Northwest
Oregon Garden, 879 W Main St, Silverton, OR  97381  Specialty:  display gardens