How does the size of weeds influence herbicide absorption and retention?

Younger weeds are generally easier to kill because they tend to have softer tissues and a higher metabolic rate, which allows them to absorb herbicides more effectively. Their smaller size means they have a greater surface area to volume ratio, making it easier for the herbicide to penetrate and be absorbed into the plant.

Additionally, younger weeds are often in the active growth phase, which means they are more susceptible to the action of herbicides. As weeds mature and grow larger, they may develop thicker cuticles and tougher tissues, which can inhibit the absorption of herbicides. Older weeds, therefore, may not be as responsive to treatments due to their more developed structures and potential resistance mechanisms.

The size of the weeds plays a significant role because larger, older plants can have more established root systems and leaf structures that are less sensitive to herbicides, making them harder to control.