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By rpdesign | 6:40 AM UTC, Fri June 12, 2026

Welcome to Lee Gilman & Associates, LLC, where we specialize in developing interdisciplinary programs to enhance the health, performance, and longevity of woody landscape plants. Our expertise extends to consulting with a diverse range of stakeholders, including owners, planners, designers, contractors, attorneys, and insurance companies. We use a comprehensive approach that empowers decision-makers to create landscapes which not only fulfill their intended purpose but also achieve their desired lifespan. By drawing upon a background in agricultural economics, we develop solutions that result in tangible net cost savings. At Lee Gilman & Associates, LLC, we are committed to continuous training and research, so you don’t have to. Our assistance encompasses a wide range of services, including landscape planning, insect and disease identification, expert witness services, tree and plant appraisals, tree risk assessments, litigation support, tree and soil protection during construction, tree and landscape problem diagnostics, and education and training. Our interdisciplinary field assessments are built upon an applied science approach, drawing from the related fields of ornamental horticulture, forestry, urban forestry, agriculture, landscape design, woodland design, site design, entomology, pathology, ecology, economics, and business management. Our previous hands-on care operations, which provided Tree & Plant Health Care services such as pruning, removals, and plant health care treatments, have been acquired by our longtime associate, Bartlett Tree Experts. This acquisition is based out of their Hooksett, NH office. Notwithstanding this change, we remain dedicated to delivering expert guidance and high-quality tree care to our clients.

Lee Gilman

NHAA Certified Arborist  #378
ISA Tree Risk Assessment Qualified
ASCA Tree and Plant Appraisal Qualified
ISA Board Certified Master Arborist #NJ-0145B
NH Licensed Supervisory Commercial Pesticide Applicator #S-2542094

Resources

General Horticulture:

  • Tree Owner’s Manual: A comprehensive guide for tree owners
  • Trees are Good: A collection of tree owner resources
  • University of Conn: Information on ornamental plant attributes
  • University of Florida: Native information
  • University of NH: Landscaping resources
  • USDA: Plants Database
  • University of Georgia: Bugwood Center for Invasive Species and Ecosystem Health
  • Cornell University: Fact Sheets
  • University of Mass: Landscape, nursery and urban forestry fact sheets

Arboricultural Associations:

  • American Society of Consulting Arborists (ASCA)
  • International Society of Arboriculture (ISA)
  • New Hampshire Arborists Association (NHAA)
  • New Hampshire Landscape Association (NHLA)
     

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