miracle grow is not good for starting seeds...too strong. just go to your nearest nursery and ask them for the best quality then read the ingrediants. it should also state the ph level, if it is top quality there'll be a full listing. i use whitney farms with much success and it seems to be available everywhere. add some cactus potting soil at 2:1 (2 parts potting to 1 part cactus mix) for an easy blend with good drainage...plus the cactus mix will tone down the acidity spagnum moss (a main ingrediant of most soil mixes) adds to the soil. i have yet to hear of decent results using miracle grow potting soil although their tomatoe ferts work well enough if directions are diluted by half and used no more than once every couple of weeks...

a good idea when 1st using a new soil is doing a ph test beforehand. they sell them at nurseries and are fairly cheap and easy to use and worth it as it'll give you a good idea of what ya have and what ya need to do (if anything) for best results.

good luck