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You should be fine. Ive completed a few grows using MG potting mix before. Even germinated seedlings in MG and no burn to seedlings. Might be strain dependant though.

Ive used MG potting soil mixed with MG perlite as well!

Its not the best soil but it works.

Ive actually heard the opposite... that the MG organic soil is too hot for seedlings.. Dont know because ive never used organic MG.
GetThisOrDie Reviewed by GetThisOrDie on . Miracle-Gro Potting Mix? Could i use this as my main soil and add some perlite/vermiculite? Miracle-Gro Potting Mix 8L from Homebase.co.uk Rating: 5