Solis Tree Service
- Tree, landscaping and garden services in the Washington, DC area, with photos.
- http://www.solistreeservice.com/

Pro Lawns Complete Landscape, Inc.
- Providing outdoor maintenance services to DC and the Maryland suburbs. Categorized service listings and company profile.
- http://www.prolawnscompletelandscape.com/

ArtGarden Design
- Creates urban gardens which consider the elements of infrastructure as part of the artwork. Features profile, photographs and community projects.
- http://www.artgardendesign.com/

Woodland Landscapes
- A landscape design-to-install company. Categorized services and photographs.
- http://www.woodlandlandscapes.com/

Cheryl Corson Design
- Provides design services for gardens and playgrounds. Includes profiles and articles.
- http://www.cherylcorson.com

Oehme, van Sweden & Associates
- Landscape architects specializing in the New American Garden style. Features portfolios, news and publications.
- http://www.ovsla.com/

Gardenwise, Inc.
- Offers landscaping architecture and garden design. Features portfolio, a newsletter and a monthly garden checklist.
- http://www.gardenwiseinc.com/

Outdoor Illumination
- Offers outdoor and garden illumination. Features articles, portfolios and testimonials, as well as an online bulb store.
- http://www.outdoorillumination.com/