How large are your rockwools and have you soaked the wool in ph balanced water of 5.5 for a long period of time? The larger the rockwool, the longer you soak them. I have the largest rockwool which i believe is 5x5, i soaked them in a ph balanced water if 5.5 for 24 hours, the reason why i soak them so long is that rockwool have a tendency of having some major ph fluctuation, sooooo them for min 6 hours to 24 or longer just to be on the safe side and for seedlings you shouldn't stick them in rockwool if they just popped, put them in a smaller medium such as rockwool PLUGS (which is a small cylinder shaped rockwool) or my favorite jiffy peat pellets. Once you see 4 of the spikey leaved then u can transfer them to a larger medium by sticking the peat pellets or the rockwool plugs into your larger rockwool cubes. I believe the hardest part in the process of growing the Jane is the seedling stage, they have a good possibility of just dying in your hands with you knowing it, just like a human baby. Take care of it.
