- Backyard Habitats Certification Program
- Clackamas Community College 19600 S. Molalla Ave, Oregon City 503-657-6958
- Great Plant Picks
- Local sources of native plants (list provided by Multnomah County)
- OSU Institute for Natural Resources
- OSU Master Gardener, Clackamas County
- Plant Hardiness Temperature Map 2023
- Portland Plant List
- Real Gardens Grow Natives blog and resources