It’s billed as a “liquid humic acid,” and is geared toward growers using garden soil, potting mixes or any soil-based media. If you think that the name “Diamond Black” is cool enough on its own, wait until you hear the name of his main ingredient, Leonardite. You didn’t know DiCaprio had his own mineral, right? All jokes aside, Leonardite is natural carbon formed from prehistoric peat bogs. It’s chock full of plant-beneficial humates. We’ve encountered those before in other GENERAL HYDROPONICS products like BioRoot. They’re great at improving abosorption of nutrients and in stimulating positive microbes (particular great for root and stem health). Diamond Black will benefit all phases of the plant growth, and a cool side utility of Diamond Black is that you can use it as an additive for making compost, should you want to rehabilitate old growing soils. This product is really for the soil-based grower, so if you’re looking for extra hydroponics punch, you’re probably better off with another additive.