What the Course Entails and Exam Details

This certification doesn't always mandate a specific "course" but rather validates comprehensive knowledge.

A central requirement is identifying over 300 plant species common to Washington landscapes.

Key domains of study include:

• Plant Identification and Selection

• Landscape Design Principles

• Soil Management and Fertilization

• Pest, Disease, and Weed Management (Integrated Pest Management - IPM)

• Irrigation Systems and Water Efficiency

• Pruning and Plant Health Care

• Safety, Regulations, and Industry Ethics

Applicants must submit a detailed application documenting their qualifying experience and educational background to WSNLA.

Once approved, the candidate is eligible to sit for the final examination, which is offered periodically throughout the year.

What to Expect in the Final Exam

The CPH final exam is a thorough assessment consisting of two main parts, typically taken on the same day.

The first part is a comprehensive written exam.

This portion uses a multiple-choice format and covers the domains outlined above, focusing on practical knowledge and problem-solving within Washington contexts.

You must demonstrate your understanding of complex horticultural principles.

The second part is a distinct practical plant identification exam.

Candidates must identify numerous live plant specimens or high-quality photographs, providing correct scientific (Latin) names and common names.

A passing score of 70% or higher is typically required for each section to receive the CPH designation.

Specific time limits apply to both the written and practical portions, emphasizing efficient knowledge recall and application.

How to Study and Exam Centers

Studying for the CPH exam requires dedicated time and an organized approach.

The official study manual provided by WSNLA is the most critical resource for the written exam.

Read the manual cover-to-cover and create detailed notes or flashcards for each chapter.

Form or join a study group with colleagues who are also preparing for the exam.

For the practical identification portion, hands-on experience is essential.

Create digital or physical flashcards for the plant list provided by WSNLA, including images of leaves, bark, and flowers/fruit.

Spend time visiting local nurseries, botanical gardens, and arboretums to observe these plants in different seasons.

The official CPH examinations are usually hosted in physical locations arranged by WSNLA.

These tests are often held in authorized test centers, community colleges, or professional development workshops across the state.

Contact WSNLA directly or check their current calendar for upcoming exam dates and approved testing locations.

Job Opportunities from the Course

Earning the WSNLA Certified Professional Horticulturist credential opens doors to advanced roles and leadership positions in the green industry. This certification is highly respected by employers throughout the state.

The CPH designation unlocks specific job opportunities, including:

• Landscape Designer / Project Manager

• Nursery Manager / Sales Manager

• Arborist

• Professional Gardener / Grounds Supervisor

• Landscape Business Owner / Operator

• Irrigation Specialist / Water Auditor

• Urban Forester

• Horticulture Instructor or Educator

• Crop Advisor or Extension Agent

This credential validates your expertise and dedication to the profession, often leading to increased earning potential and career longevity.