There is probably a different product in the line for the next stage of growth. I know with future harvest I use Bud Start for the first 2 weeks of flower, Ton O Bud for weeks 3-4, and Bud Boom for weeks 5-Harvest according to their feeding schedule. They all have different NPK ratios for what your plant is going to want for that specific time in its growth, producing more sugars, focusing on bud growth, etc