True or False: Herbicides best penetrate leaves during hot, dry winds when the leaf surfaces are thick and waxy.

Herbicides penetrate leaves more effectively when conditions are optimal for absorption. Typically, this includes scenarios where the leaf surface is not overly thick or waxy. Under hot, dry winds, the plant may close its stomata to reduce water loss, which in turn can limit the uptake of herbicides. When leaf surfaces are thick and waxy, it acts as an additional barrier, restricting the ability of herbicides to penetrate effectively. Therefore, the statement is false as it inaccurately associates effective herbicide penetration with less favorable environmental conditions and leaf structure.