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Question 1
Which plant variety is known as Lipstick Strawberry?
Correct Answer:
Fragaria 'Lipstick'
Explanation:
Lipstick Strawberry is a specific cultivar known for its striking appearance and edible qualities, making Fragaria 'Lipstick' the correct answer. This plant variety is cherished for its attractive foliage and vibrant fruit that can enhance both ornamental gardens and edible landscapes. The name "Lipstick" reflects its robust red berries and vibrant green leaves, which together create a visually appealing plant that often attracts gardeners looking to combine beauty with functionality. The other choices represent different plants with distinct characteristics. Gaultheria procumbens, commonly known as wintergreen, is valued for its fragrant leaves and red berries but does not share the qualities that would earn it the nickname Lipstick Strawberry. Clematis 'Jackmanii' is a popular climbing vine known for its large purple flowers, while Cornus canadensis, also known as bunchberry, is a groundcover that produces small white flowers followed by red berries. None of these plants exhibit the same aesthetic or edible traits associated with Lipstick Strawberry.
Question 2
What is the common name for Blechnum spicant?
Correct Answer:
Deer Fern
Explanation:
The common name for Blechnum spicant is indeed Deer Fern. This particular fern is native to the Pacific Northwest and is often found in moist, wooded areas, typically growing in shaded locations. Its habit of producing glossy, evergreen fronds makes it a popular choice in landscape settings, appreciated for both its aesthetic qualities and its ability to thrive in less than ideal conditions. Deer Fern gets its name due to its palatable nature to deer, which will often browse on the foliage. This characteristic is significant for those managing gardens or natural areas where deer may be present. The other options refer to different species with distinct characteristics. Bracken Fern, for instance, is known for its tall, coarse fronds and can often dominate grassland areas. Common Fern is a vague term that doesn't specifically point to a scientifically recognized species. Royal Fern, on the other hand, is a larger fern with a different growth form and habitat preference. Each of these options represents unique plants that do not share the specific traits or characteristics associated with Blechnum spicant.
Question 3
What is the typical habitat of the Maidenhair Fern?
Correct Answer:
Shaded, moist areas
Explanation:
The Maidenhair Fern typically thrives in shaded, moist areas due to its natural habitat preferences. This fern species is commonly found in forests, along stream banks, and in other locations where the environment offers a cool and humid climate. The moisture in the soil is essential for its survival, as it helps prevent the leaves from curling and supports the delicate structure of the fronds. Furthermore, the shaded conditions protect the fern from direct sunlight, which can cause the fronds to dry out and become damaged. This combination of moisture and shade is crucial for the Maidenhair Fern to flourish, making shaded, moist areas its ideal habitat.
Question 4
Which plant is also known as Vinca or Periwinkle?
Correct Answer:
Vinca minor
Explanation:
The plant known as Vinca or Periwinkle is Vinca minor. This species, also known as lesser periwinkle, is a perennial ground cover that is commonly used in gardens for its attractive foliage and blue-violet flowers. Vinca minor is valued for its ability to thrive in a variety of conditions, making it a popular choice for areas with poor soil or shade. It has a trailing habit and can effectively suppress weeds. Vinca major, while also referred to as greater periwinkle, is a related species that is typically larger and has broader leaves. However, the term "periwinkle" is most commonly associated with Vinca minor in horticultural contexts. Ajuga reptans, known as bugleweed, and Euonymus fortunei, commonly referred to as wintercreeper, are entirely different plants that do not fall under the Vinca category. Thus, Vinca minor is the correct answer as it embodies the common name most closely linked to "Vinca" or "Periwinkle."
Question 5
What common name is associated with the plant Hemerocallis?
Correct Answer:
Daylily
Explanation:
The plant Hemerocallis is commonly known as Daylily. This designation comes from the structure of its flowers, which typically bloom for only one day, hence the name "daylily." The flowers are often seen in a variety of colors and have a distinct, often funnel-shaped appearance. Daylilies are widely appreciated in gardens due to their hardiness, adaptability, and ability to thrive in a range of soil types, as well as their low maintenance requirements. They are perennial plants, meaning they return year after year to provide vibrant blooms. The other names listed do not correspond with Hemerocallis. For instance, sunflowers refer to a different genus known for their large blooms and seeds, while dayflower refers to a separate group of flowering plants in the Commelinaceae family. Nightshade is commonly associated with the Solanaceae family, which includes plants like tomatoes and potatoes, rather than Hemerocallis. Thus, the choice of Daylily as the correct common name reflects the plant's unique characteristics and widespread recognition among gardeners and horticulturists.
Question 1
Exam overview

About this Exam

The WSNLA Certified Professional Horticulturist (CPH) designation is the premier credential for individuals in the horticulture industry in Washington State.

It is designed for professionals who have established knowledge in plant identification, landscape management, and best practices relevant to the unique Pacific Northwest environment.

Earning this certification demonstrates your commitment to the highest industry standards.

It is ideal for experienced nursery employees, landscape designers, gardeners, and those seeking advanced careers in green industries.

A minimum of 24 months of relevant field experience or a combination of education and experience is typically required before applying.

This guide helps you prepare effectively for the rigorous practice exam, ensuring you are ready for the official assessment.

More details

Additional Information

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.


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