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- American Rose Society
Membership information, local societies, and the Rose of the Month, and, American Garden Rose Selections
- Botanical Society of America Online Image Collection
Browse collections of botanical images.
- Flowering Plant Gateway
Four systems of flowering plant classification.
- Forage Information System
A comprehensive resource for forage-related topics, including Extension, research, and teaching information. Produced by Oregon State University.
- Garden Aesthetics
Produced by Linda Engstrom, PCC.
- Garden Web
Gardens of the world; forums and information files for gardeners.
- Global Invasive Species Team
Part of The Nature Conservancy's response to abating the damage caused to native biodiversity by the human-facilitated introduction of non-native, harmful invasive species. This website provides many resources designed to help all conservationists deal most effectively with invasive species.
- How to Identify Trees
Friesner Herbarium, Butler University Tree Identification Website.
- OSU Extension Service
- Pacific Northwest Home Gardener
Links and advice for the local climate.
- Parasitic Plant Connection
Browser Order/Family pages; many photos.
- Plant Care.Com
Database of over 2000 indoor houseplants. Subscription required for full access.
- PLANTS Database
National Resources Conservation Service, USDA. Search by state. Lists available include noxious weeds, plants endangered in the United States.
- Seed Germination Database
Browse alphabetical list from the Backyard Gardener.
Database of phylogenetic knowledge.