I'm shopping around and I noticed on the back of the bottles they say to use the product during week 2 through 6 of flowering.... so I'm guessing that means during the flowering stage I would start using it on week number 2 all the way through week 6? or do I use it on week 2 and again on week 6? also it doesn't say how often to apply. On some of the labels I was reading it just says to apply?? do you do this every other watering, every third watering? Why do these labels not go into specifics at least not on the ones I was looking at.