What is a primary concern when using ester herbicides near ornamental plants?

Using ester herbicides near ornamental plants raises significant concerns about vapor drift injury. Ester herbicides are known for their volatility, which means they can evaporate and form vapors that drift away from the intended application area. This volatility can pose a risk to nearby sensitive plants, such as ornamentals, which may suffer damage from exposure to the herbicide vapors even if the application is made with care.

When considering agricultural practices, it is critical to use herbicides appropriately to minimize unintended consequences. Vapor drift can lead to symptoms such as leaf burn, stunting, or even death in sensitive plants, which is why it is crucial to be cautious and understand the behavior of the chemicals being used.

While cost, resistance development, and soil acidity are also factors worth noting in herbicide application, they do not directly align with the immediate risks posed to ornamental plants specifically in relation to the use of ester herbicides.