One characteristic of Roundup (glyphosate) that customers sometimes object to is

Customers often express concern about the time it takes for Roundup (glyphosate) to effectively kill weeds. This is primarily because glyphosate works by being absorbed through the leaves of plants, then traveling down to the roots where it disrupts plant growth processes, which can take several days to manifest visibly. This delay can be frustrating for those who expect immediate results, especially in situations where rapid weed control is desired, such as before planting or maintaining a pristine garden appearance.

The other options do not align with common customer objections; glyphosate is generally considered to have low toxicity to pets when used as directed, its long-lasting effects are often seen as beneficial for controlling weeds over time, and while it can stain if mixed incorrectly, staining the soil surface orange is not a widely reported concern among users. Therefore, the characteristic that resonates most significantly with customer feedback is the length of time it takes to see the desired effect on weeds.