Growth_(SMAC) affects your population growth rate. The higher your score, the fewer nutrients(link) your bases will need to grow. -3: Near-Zero Population Growth -2: -20% growth rate -1: -10% growth rate 0: Normal growth rate 1: +10% growth rate 2: +20% growth rate 3: +30% growth rate 4: +40% growth rate 5: +50% growth rate! 6: Population Boom!!