I'm wondering how often should I feed the beneficial microbes in my soil.
I've wondered about it, too. I'm still somewhere in the middle of the learning curve on this one.
My understanding is that the microbes live in symbiosis with the plant, which means the microbes feed the plant and the plant feeds the microbes. So, adding sugar would give them extra food to expand their numbers (i.e., bloom), but they also would depend on that sugar, not the plant, creating an artificial soil environment and more nutrition for the plant if the roots can access it. Initially, while the plant is in early vegetation, that probably would be a benefit. Once the microbes and the plant are growing vigorously, I'm not sure the added sugars would be as useful. Later, however, toward the end of the flowering stage, which is typically when nutrients are being depleted, added sugar would sustain the microbes as the plant is less able to do so and provide it with more energy to finish. I've been told that adding sugar late in flower is absurd, though, but it makes sense to me.