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ROOT AND GROWTH BOOSTER Second in the Aptus premium collection is Startboost, a dark smelly, concentrated liquid designed to stimulate root growth, vegetative growth, enhance soil micro-life, and increase soil structure and fertility. Startboost is 100% organic with bioactive ingredients which encourages the development of the root system and vegetative growth. Specific micro-life biomass works to enhance root development. It stimulates root hair development while conditioning the soil and providing bioavailable nutrition during vegetative growth.