Raw Nutrients - YuccaNatural Wetting Agent Boosts Nutrient Penetration Yucca powder works as a powerful wetting agent (or surfactant), helping to get the very best performance from the nutrients in your feeding regimen. Wetting agents are used to help nutrient solutions penetrate the substrate so that they can delivered successfully to root systems. They work by reducing the surface tension of water, allowing it to spread out evenly over anything that it comes into