is blackgold mix #4 soil good to use ??

i bought a bag and could not find much info on if its good for growing weed so far its been good on the 4 plants i have it in but i red some things that im not sure if its true or not like do i need to add some cow compost to it to make it better or does it even need it im just so confused its also my first grow if i do need to add some cow compost to it or anything like that please and thank you let me know :)
 
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