I make my own all purpose mix which works extremely well for germination as well as potting up. I also use it for my self watering containers which works very well. I stay away from miracle-gro products since they are not organic and have chemicals in them.
What I do is buy large bags of peat moss, vermiculite, and perlite, and mix them at a 70/20/10 ratio (in that order). I mix them in a large 25 gallon plastic tote outside, the put the lid on and bring it in the house near my seed starting area. Making my own mix is much cheaper than buying pre-bagged stuff. It's enough to start thousands of seeds, pot them up, and get them out to the garden.
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