Virtual library of gardening links General gardening site with extensive list of links that take you all over the world of gardening.
Univ. of Minnesota Sustainable Urban Landscape Information Series: Research-based information on design, plant selection, implementation and maintenance of sustainable urban landscapes.
Directory of gardens and garden clubs: General gardening site that includes a directory of gardens and gardening clubs, event calendar, gardening forums and more.
International Society of Arboriculture tree care information: Quality information on tree care.
Plant Amnesty pruning information: Pruning guidelines from a Seattle area organization dedicated solely to good pruning practices.
How to compost: Overview of composting topics plus links to many other composting sites, only some of which are research-based.
Friends of Trees : Tree database, list of trees for the garden, restoration trees, schedule of events, partnering arborists.
Nature Conservancy: National and International Information
Oregon Nature Conservancy: Local information, Online field guide, events and more.
Friends of Tryon Creek: Events, classes, history of the park.