- Virginia Department of Agriculture and Consumer Services
- Virginia Grown
- Virginia Cooperative Extension
- Pest Management Guide (Chapter 7)
- Virginia Department of Forestry
- Virginia Department of Forestry Seed Catalog
- National Christmas Tree Association (NCTA)
- North Carolina Christmas Trees
- Pennsylvania Christmas Tree Growers Association
- Virginia Agribusiness Council
- Virginia Nursery and Landscape Association
- What’s Growing On In Virginia
- Mt. Rogers Christmas Tree Growers Association