SensiZym contains over 80 different enzymes each having specific functions that enhance plant and root growth. Sensizym breaks down dead root mass, starches, carbohydrates and nutrients which accelerate plant growth as well as assist beneficial bacteria growth. It also helps to catalyze water and assist the transfer of water elements to specific sites. You can speed up the cell replication rate and regulatory processes of a plant by using Sensizym. This product is absolutely necessary for optimum growth and should be used during the entire lifespan of the plant. Hydroponics r us recommend to use Sensizym throughout all stages of flower. Save on price by buying this 5L version.