Which formulation type is not affected by water solubility?

Granules are a formulation type that is not significantly affected by water solubility because they are typically composed of solid particles that are not designed to dissolve in water. Instead, granules are often formulated to release their active ingredients slowly through processes such as diffusion or when they are disturbed by moisture or movement in the soil. This characteristic allows granules to remain effective in various soil conditions and even in dry situations where soluble products may not perform as intended.

In contrast, wettable powders, soluble powders, and flowables rely on the ability to mix with water and dissolve or disperse to release their active ingredients effectively. The performance of these formulation types is heavily influenced by their solubility in water, which determines how quickly and effectively they can be applied and absorbed by target pests or plants. Therefore, granules stand out as a unique formulation that operates independently of water solubility.