Roots Organics Extreme Serene is a natural source of botanical extracts and nutrients for plant growth. Our revolutionary new formula improves upon the original: We have targeted and isolated crucial nutrients in various kelp species and stabilized the solution for maximum absorption. Extreme Serene captures the growing power of marine kelp to improve conditions for vigorous shoot and root growth. Use Extreme Serene in conjunction with any nutrient program or as a foliar feed.