The study of plants has always facinated me. Of the many plant science disciplines, horticulture is my favorite. As a landscape designer, I strive to make the most of outdoor spaces, both aesthetically and functionally. It is my goal to promote sustainable horticultural practices while enjoying the tremendous beauty of the diverse plant world. It is also my ambition to be a life-long student of all the many facets of horticulture.

—Lise Pittman Foy, CPH

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

ASHS-Certified Professional Horticulturist Registry -

• CPH Listing by State/Province (A-C)
• CPH Listing by State/Province (D-H)
• CPH Listing by State/Province (I-M)
• CPH Listing by State/Province (N-P)
• CPH Listing by State/Province (R-W)

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:

• Application Booklet (PDF format)
• Continuing Education Unit (CEU) Reporting Form (PDF format)
• Reporting Form Instructions (PDF format)
• Questions? Please contact the CPH Program Coordinator at This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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.