I've done about six crops with Mammoth P... As pricey as it is, it changes the plant growth significantly... In veg, just a small amount significantly improves the root system and makes the stems and stalks stiffer... In flower, it helps the buds significantly gain mass... Only "problem", the combination of stiffer branches with much heavier flowers weighs the branches down so much they tend to snap on fiery strains (Pineapple Chunk and Gorilla Bomb especially)... I tend to have to support my plants toward the end of flower... With Mammoth P, I have to add support much earlier and, if I don't support every branch, I have to use more Gorilla Tape to repair branches that separate themselves from the plant trunk. Best of Luck!