BudXsanswered grow question 5 years ago Yes, you need to be careful with this stuff, and use it accurately, learn from my mistakes. Use it when buds are fully formed but young and all white. This week # varies by strain so go by eye. Use it till about 15 days before harvest, no longer. Here is the VERY important part if you want to avoid yellow crispy curled up burnt looking leaves: use 1/4 to 1/2 of the recommwnded dosage ESPECIALLY if feeding along side other nutes. IT IS SO EASY to get a PK burn, as the plant will want to just OD on the stuff. Start slow, dose up slow, see any yellow, flush immediatedely. PK burn happens overnight and the leaves never bounce back. The juice itself is awesome, as is any bloom booster if used right. If done right, no can defeat - Miyagi