Advanced Nutrients - OG Organic Grandma Enggy's F-1 - 10 L - Case of 2Grow big, lush, compound rich buds with one of natures most potent plant potentiators. OG Organics Grandma Enggys F 1 features short and long chain humic acids, essential nutrients, and other unique elements derived from leonardite, a volcanic rock thats millions of years old. When you put leonardite to work for you and your crop, this rich organic matter gets to work assisting nutrient uptake, so you can optimize every phase of your plants