LT...I actually hand picked a group of them in Amsterdam. They are feminized, but that unfortunately we know that isn't always a 100%. Jerkin, I never check PPM and always go from light to full strength with my nutes. Here is the way I look at it, in the general scheme of things. I think about how this plant would grow in the wild. Call me crazy, call me what they will, but I have been succesfull every time I grow, a loss of a plant here or there, either hermed or was a male, but I always have been able to grow great smoke. I don't care what degree someone has, there is no perfect PPM and PH where a plant comes from. Yeah, there are "perfect" conditions to grow by, but to me, I am not getting caught up in all of that. I enjoy watching the plants grow as I smoke my own!! Guys who are in and technically out of the city limits out of Amsterdam, two of them who are very well known in our community, don't gauge a damn thing. I personally visited with them. They watch their plants. They know their environments, their nutrients of choice, and they feed on a regular cycle. Hey, it's my two cents, but it works for me!!