Certified Professional Horticulturist (CPH) Practice Exam

In landscape design, what is the primary consideration for plant selection?

1. Personal preference

2. Plant hardiness

3. Cultural practices

4. Availability of plants

The correct answer is: Plant hardiness

In landscape design, the primary consideration for plant selection is plant hardiness. This refers to a plant's ability to survive and thrive in specific environmental conditions, such as temperature, humidity, and soil type. Understanding plant hardiness ensures that the chosen species can withstand local climate extremes, pest pressures, and soil characteristics, which ultimately contributes to the success and longevity of the landscape design. While personal preference plays a role in selecting appealing plants, it must be balanced with the practical requirements of the environment. Cultural practices, such as maintenance and growth habits, are important but secondary to ensuring that the plants are hardy enough for the specific location. Availability of plants is also a consideration, but it is secondary to ensuring that the selected plants will actually thrive in the intended setting. Therefore, plant hardiness is fundamental to creating a sustainable and resilient landscape.