VermaPlex Liquid Yucca Extract Liquid Yucca Extract is a 100% natural wetting agent derived from Yucca schidegera. Our Yucca Extract is cold-pressed for maximum biological activity. As a wetting agent, Yucca Extract can be added to almost any liquid fertilizer mix, as part of an overall fertilization program. Liquid Yucca Extract increases soil permeability, allowing water and nutrients to reach plants faster. It also improves the soil's water-holding capacity and soil structure. 100% organic, Liquid Yucca Extract is cold-pressed for maximum biological efficacy.