Roots Organics Extreme Serene - 1 GAL / 4 L - Case of 4Roots Organics Extreme Serene is a natural source of growth promoting nutrients and botanical extracts. Our revolutionary new formula improves upon the original: We have targeted and isolated crucial components in various kelp species and stabilized the solution for maximum absorption. Extreme Serene captures the fast growing power of marine kelp to encourage vigorous shoot and root growth. Use Extreme Serene in conjunction with any nutrient program