International Society of Arboriculture

Through research, technology, and education, the International Society of Arboriculture (ISA) promotes the professional practice of arboriculture and fosters a greater worldwide awareness of the benefits of trees. http://www.isa-arbor.com//

Howard Garrett - The Dirt Doctor

Howard Garrett is a landscape architect by training, with extensive experience in landscape contracting, greenhouse growing, golf course planning and maintenance, and organic product development. Howard has devoted his life to establishing a leadership role in the natural organic marketplace. He provides advice on natural organic gardening, landscaping, pet health, pest control and natural living. http://www.dirtdoctor.com/

Native Plants of Texas

Dedicated to the cultivation and propagation of Texas Native Plants and Wildflowers. http://www.npot.org/

Texas Nursery & Landscape Association

The Texas Nursery and Landscape Association's Mission is to Enhance Members' Business Success Through Legislative/Regulatory Advocacy, Education, Networking, and Promotion of Professionalism. http://txnla.org//