House & Garden Algen Extract contains a very high percentage of Aschophyllum nodosum. The extract is therfore rich in both macro nutrients (N,P, K, Ca, Mg and S) and micro nutrients (Mn, Cu, Fe and Zn). Algen Extract stimulates the growth of the root system to enable the plant to absorb more nutrients. Also, it increases the resistance of the plant and stimulates the production of chlorophyll. A larger root system guarantees improved growth during the entire season.