I noticed I get an average of about 8 bad leaves - however, when more of the 8 are on less plants then it appears worse since you have to chop up the plants more; whereas a leaf here and there amongst the 15 plants doesn't seem to show as much. I've done it in fast and slow, with literally tons of fertilizer and Bio-food just to compare and it is always about the same. Once in a while I will have fewer bad ones but in end it averages to about the usual 8 or so.
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I love classical music and so do my plants!