What are the suggested ways to flush soil plants? I am pulling in almost a half pound per plant. For how long before I harvest should I use what and how much and how often. Would it b benificial to physically rinse the roots down and finish them hydroponically? They r in 7 gallon pots. I'm using botanical nutes. I usually just stop all nutes 2 weeks prior to harvest and only give the normal amount of water.