Which statement is true regarding the use of TGRs?

The statement that both B and C are true regarding the use of Tree Growth Regulators (TGRs) provides a comprehensive understanding of their application.

TGRs can indeed be utilized effectively in residential areas. They are often used to manage tree growth, enhancing the landscaping aesthetics and reducing the frequency of pruning required, which is particularly valuable in populated settings where space is limited or where specific tree heights are preferable for safety and visibility.

Additionally, the potential for harm when TGRs are used incorrectly cannot be overlooked. Improper application can lead to negative biological effects on the trees, including issues with health, growth patterns, and even mortality. It is crucial for users to understand the proper methods of application, dosage, and timing to ensure that these substances achieve the desired outcomes without adverse effects.

This dual understanding of effective application in residential areas and the caution required in their usage highlights the importance of knowledgeable and responsible use of TGRs in both settings, validating the correctness of the combined statement in the selection.