The benefit of blackstrap molasses extends beyond carb loading, it has calcium, magnesium, potassium, b vitamins, and many trace minerals. All that being said, blackstrap molasses is not so much for feeding the plant its self as it is for feeding the bacteria and fungi in the soil, which in turn help to feed the plant. But be careful that if you use it you use blackstrap molasses (unsulfured), as molasses is sold in several varieties according to which part of the extraction process it comes from. Most molasses is from the first or second stages, as molasses from these stages is much lighter and sweeter, and generally more palatable for people. Blackstrap molasses is from the final step, when as much extraction as possible has occurred, it is much thicker and very strong, almost bitter, tasting (I happen to love it, I eat a couple spoonfuls a day as a dietary supplement). Generally speaking blackstrap molasses will be a bit more expensive than the other varieties, but it is really the only one that is majorly beneficial and is worth the extra.