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Certified Professional Horticulturist
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The ASHS Certified Professional Horticulturist (CPH) program identifies qualified horticultural professionals for excellence in educational, scientific, and service activities with public and private agencies.

Established in 1991, the CPH program sets standards and maintains procedures for official certification of individuals having recognized credentials in the horticultural field.

A CPH may be sought to:

  • Consult for industrial and commercial horticulture ventures
  • Advise government
  • Give legal testimony
  • Provide valid information to the media

Benefits of CPH certification:

In addition to assisting professional advancement, CPH certification also contributes to the status and visibility of horticulture by:

  • Promoting and encouraging professional development, growth, and renewal
  • Publicizing and exemplifying the CPH Code of Ethics
  • Meeting state and national requirements regarding professional recommendations to the public


To apply for CPH Certification:

Process of Certification:

• Applicant must complete and submit the application booklet and application fee.
• ASHS will process the application and collect reference forms.
• Completed application will be submitted to the CPH Board for review. 
• The CPH Board will either approve or deny certification based on the application.
• If approved, a certification fee will be collected. Certification fees are collected every two years. Fees are $175 ASHS Members and $295 Non-Members.

The CPH Certification process takes approximately 4-8 weeks.

Administered by the ASHS Certified Professional Horticulturist Board, (CPHB), a CPH certification is granted based on scholarly presentation, required participation in continuing education programs in particular areas of specialization, and work experience supported by references. Individuals certified by the CPHB have met educational and practical experience standards, subscribe to the CPH Code of Ethics, and qualify for identification and recognition as professionals of excellence in their field.

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