Backyard Habitats: www.backyardhabitats.org
Clackamas Community College 19600 S. Molalla Ave, Oregon City, 503-657-6958 http://www.clackamas.edu/
Crystal Springs Rhododendron Garden 6200 SE 28th Ave, Portland, 503-771-8389 https://www.portlandoregon.gov/parks/finder/ index.cfm?&propertyid=27&action=viewpark
End of the Oregon Trail Pioneer Gardens 1726 Washington St. Oregon City http://eotpioneergarden.blogspot.com/
Great Plant Picks for the Pacific Northwest http://www.greatplantpicks.org/
Grow an Extra Row CCC Community Garden 19600 S. Molalla Ave, Oregon City. https://clackamascountymastergardeners.org/grow-an-extra-row/ Seasonal workdays Tues & Fri 9am-noon, Apr-Oct
The Hardy Plant Society of Oregon, 503-224-5718 http://hardyplantsociety.org
The Home Orchard Society http://homeorchardsociety.org
Hopkins Demonstration Forest 16750 S Brockway Rd. Oregon City https://www.demonstrationforest.org/
International Rose Test Gardens at Washington Park, https://www.portlandoregon.gov/parks/finder/ index.cfm?&action=ViewPark&propertyid=1113
Comprehensive Guide to the Vascular Plants of Oregon: https://oregonflora.org
OSU Master Gardener, Clackamas County https://clackamascountymastergardeners.org/
Peninsula Park Rose Garden 699 N. Ainsworth St. Portland, https://www.portlandoregon.gov/parks/ finder/index.cfm?action=ViewPark&PropertyID=1125