About to start six new seedlings, at my disposal I have Roots Organic original formula, Miracle Gro ( I know, would be first couple weeks only if used ) or dirt from my yard, I will make sure to dig super deep and get the good black soil from under a tree , or I could mix any combination of the three, what do you guys think would work best for starting seedlings. Edit, a lot of people say Roots Organic Original will burn them up, yard soil doesn't have the same aeration. Seriously considering robbing the soil from my gf's raised bed garden box, she has been growing herbs and flowers in it, has perlite in it, probably other good stuff, but has been watered only , and mixing it 50/50 has anyone ever tried this?