try 1ounce in he seed starter trays,anther cell in tray,try 1 tablespoon.if this dont work,ueither watering at wrong time,or ph,wud be las option,in this case.it will def. work with tap water 7.4,and any miraclegrow,soil, or schultz,,50% poting soil,25% perlite,25% verm,u can later transplant to this mix.for seedlings 50% poting soil ,50% perlite.i use a qt. sprayer bottle to aplie watering,for me 15 sprays from my qt. sprayer=1 tablespoon,also...2 tablespoons=1ounce.write doen how much water ur using.if u really need to,cut out 1 cell of seed tray,fill with dry poting soil,take another cell,the one ur growin in,wen it weighs the same amont as the dry one or very near there water.this should help u figure it out.if u need moe help,just holla-back.we,s here for yo. peace buthead/