CANNA 9321025 Rhizotonic 250-ml is a powerful, algae based, vegetative stimulator for roots of fast-growing plants that already have roots or root initials. Rhizotonic stimulates further root development, increases the plants resistance to disease and promotes its inner and outer strength. Rhizotonic is naturally sourced and contains multiple vitamins. Using Rhizotonic will improve plants that are unhealthy or poorly developed. Rhizotonic can be used regardless of the type of medium. It is suitable for cultivation in hydro culture and potting soil. You can even spray Rhizotonic on the leaves and can also be used as a simple means for raising the pH level in fertilizer tanks.