Certified Professional Horticulturist (CPH) Practice Exam

What is the most likely result of root pruning plants that are grown in the ground?

1. Increased shoot growth

2. A compact root system

3. Production of large flowers

4. Stronger stems

The correct answer is: A compact root system

Root pruning plants that are grown in the ground commonly leads to a compact root system. The act of pruning the roots stimulates a plant's response to form new, shorter roots which overall can enhance root density. This process can encourage the plant to develop a more fibrous root system with a higher proportion of fine roots, which can be more efficient for nutrient and water uptake. Increasing the density of the root system can contribute to greater stability and support for the plant during its growth. A compact root system is particularly beneficial in landscape settings, where it helps to conserve space and minimizes competition with surrounding plants. This is crucial for achieving optimal performance and aesthetics in garden and landscape design. In contrast, the other answers do not accurately reflect the primary outcomes of root pruning. While root pruning may lead to increased shoot growth in some cases, the more immediate and noticeable change is the formation of a compact root system. Additionally, while larger flowers and stronger stems could be secondary benefits of a healthier root system, they are not direct results of the root pruning itself.