GMSgrowsanswered grow question 4 years ago Potting soil is already supplied with nutrients and may be to heavy for your young girls. It may take some time to get use to the potting soil. It has slow release ferts in there. Theres also a lot of peat so I am not sure whether this would be soil or a soiless grow. Ph and ec levels are different for each method. I use straight Nutramix HP or Promix. Straight peat and perilite which makes mine a soiles grow. Makes it easy to figure out how much to feed and the correct ph to feed at. Hope all works out for you my friend. Cheers