Horticultural Therapist-Registered (HTR)

Horticultural Therapist-Registered (HTR)

The Horticultural Therapist-Registered (HTR) credential represents a legacy standard of excellence in the field. While this credential is no longer open to new applicants, we proudly recognize and honor the dedicated practitioners who hold the HTR designation.


These professionals continue to deliver vital horticultural therapy services aligned with the core framework defined by the AHTA:


  • The engagement of a participant in horticultural-related activities.
  • The participant has an identified disability, illness, or life circumstance requiring services.
  • The activity is facilitated by a registered horticultural therapist.
  • The participation is in the context of an established treatment, rehabilitation, or vocational plan.

The Horticultural Therapist – Board Certified

The path forward for professional distinction is the Horticultural Therapist – Board Certified (HT-BC) designation. As the industry’s premier gold standard, the HT-BC is the definitive credential for practitioners dedicated to professional excellence, evidence-based practice, and leadership in the field.

People talking outside on bench

Navigating the Transition for Existing Credential Holders

The introduction of the HT-BC represents a natural evolution of our profession. As we elevate our standards to a national competency model, we are committed to supporting our current practitioners through this transition.

How does the HT-BC impact current designations?

Registered Horticultural Therapists (HTR)

The certification is designed for individuals seeking to be recognized as credentialed horticultural therapists. 


The HT–BC will eventually replace the current HTR designation as the primary credential in the field. 

Therapeutic Horticultural Practitioners (THP)

The certification exam will not be required for Therapeutic Horticulture Practitioner (THP) applications at this time.

What about those with HTRs or those pursuing their HTR?

Current HTRs

Current HTRs may continue to use their designation and AHTA will continue to recognize this legacy. 


Current HTR designees are encouraged to become certified under this new national competency standard.

Prospective HTRs

HT–BC will eventually replace the current HTR designation as the primary credential in the field.


AHTA will stop accepting new HTR applications July 1, 2026. This is before the launch of the certification exam. After that, all new applicants will apply for the HT–BC.

graphic reading: Introduction to Horticultural Therapy and Education Requirements for Professional Registration

Professional Registration & Ethics

The Horticultural Therapist-Registered (HTR) credential ensures that professional competencies have been achieved based on standardized academic requirements and professional training. While this designation is no longer open to new applicants, it remains a recognized credential of honor within the field.


Professionally registered horticultural therapists are expected to adhere to the AHTA Code of Professional Ethics for Horticultural Therapists. The AHTA's Standards of Practice for Horticultural Therapy describe the ongoing expectations of professional conduct and the delivery of horticultural therapy service.

hands holding plant

Maintaining Your HTR Registration

If you're a current HTR, you must maintain Professional-level AHTA membership annually to keep your HTR status. After 3 months of lapsed membership, you'll pay a $75 reinstatement fee.

Frequently Asked Questions

  • What happens to my current HTR designation?

    We deeply value the expertise of our existing HTRs and HTMs. You may continue to use your current designation and are not required to take the HT-BC exam to maintain your standing. The new board certification will simply become the primary credential for new applicants entering the field after July 1, 2026.

  • Why is the AHTA moving from a registry to a board certification?

    Certification provides a more robust, third-party validation of a professional’s knowledge and skills. By introducing a comprehensive examination based on core professional domains, we are building stronger public recognition and aligning our field with the highest standards of professional practice.

  • If I am currently working toward my HTR, can I still apply?

    No. After July 1, 2026, all new applicants for professional credentialing will move through the HT-BC pathway, which includes the board examination.

  • How does board certification differ from a certificate program?

    While a certificate is awarded for completing a specific educational course + professional requirements, board certification is a formal evaluation of your entire professional scope. It combines your education and verified experience with a standardized test to ensure a high level of ethical and practical competence.

  • Will study resources be available for the new exam?

    The AHTA is dedicated to supporting our community through this growth. We intend to provide a comprehensive Candidate Handbook, sample questions, and a list of recommended resources to help eligible candidates prepare for the inaugural testing window.

Explore AHTA Credentialing Pathways

New applicants can choose between two professional paths:


  • Therapeutic Horticulture Practitioner (THP): The foundational path for entering the field and establishing your core skills.
  • Horticultural Therapist—Board Certified (HT-BC): For advanced professional excellence and industry leadership.