MIMedGrower
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The molasses was for the benefit of the microorganisms in the living soil system. Slowly, over time, people started to add the molasses in because living soil, when it is done right, is great. The problem with living soil is that it is more difficult to do correctly than growing buds... unless you have the micro-biome to use the molasses, you are just putting sugar into the soil with no benefit to the plant.
It is the same as adding sugar to grape juice but having no yeast to use the sugar... you end up with very sweet grape juice. The idea sounds wonderful and organic and kind, etc etc.... but it doesn't help things out unless you have the proper soil to use the molasses, which is broken down into compounds that the plant uses. No microbes (of the right kind), no benefits. I'm sure I'll get my ass handed to me for making this bold statement, but I've grown long enough to know fact from fiction. Living soil is great, but not easily done. Molasses just makes for sticky soil, otherwise. Roots can't absorb sugars.
Deeding the microbes sugar causes a bloom of bacteria. However it dies right back down after the food is used up and all that time they are not feeding the plant as jey are getting their carbs (food) from an outside source instead of the plants roots.
Yes an unpopular but true opinion. Molasses can do nothing good for a plant.
Proper live organic soil works symbiotically with the plant and needs no help.