The last two weeks of flower the plant will stop sending carbohydrates to the roots to feed the soil biome. All of the energy is used by the plant to produce the flowers in an effort to reproduce. This is when you use molasses. It is to feed the soil microbes so they in turn will continue to make nutrients available to the plant. I even use it in hydro except DWC where there is no biome to speak of. Coco and rock wool will have a biome created by the roots during the grow. This is also a good time to use a little Recharge but don't go crazy with it. A little molasses goes a long way.