I wouldn't use soil with synthetic fertilizers already in it...
I've been using "Nature's Care Organic & Natural Potting Mix with Water Conserve"
It has Alfalfa Meal, Bone Meal, Earthworm Castings, Kelp Meal, Peat Moss, Coco Coir, Yucca, and Perlite.
And it is OMRI certified, so you know that it is 100% organic.
It's only 10 dollars for one of those huge bags at Home Depot or Lowes, and it's not as expensive as those 30 or 40 dollar bags of Fox Farms Ocean Forest.
This is my plant growing in Nature's Care Natural Potting Mix at 5 weeks old... The green onions are also growing in the same soil, and they are at 1 week old.