Which type of herbicides are known for causing growth overstimulation?

Phenoxy herbicides are recognized for causing growth overstimulation, primarily because they mimic natural plant hormones known as auxins. When applied to plants, these herbicides can lead to excessive and uncontrolled growth, resulting in deformities and eventual plant death. This characteristic makes them particularly effective against broadleaf weeds, which are susceptible to the hormonal imbalances caused by these substances.

In contrast, chlorophyll inhibitors target the process of photosynthesis, non-selective herbicides affect all plant types indiscriminately without promoting growth, and selective herbicides are designed to eliminate specific weeds while minimizing damage to desired crops. Therefore, the unique action mechanism of phenoxy herbicides—excessively stimulating growth—validates their classification in this context.