I took a chance on a pallet of Ag Blend potting soil at Green Tree (Biochar, Bio 365) and it was a big mistake. I wanted to warn everyone against this product.
The blend was clearly inferior to VT Compost and McEnroe's, with poor germination and undernourished seedlings. There were also weed seeds, a sedge, perhaps even nutsedge (!) in the bags. I have had to amend this mix with large quantities of 5-4-3 and blood meal.
I like to have bagged soil for my winter microgreens and will be going back to McEnroe, in addition to buying more VT Compost.
Best,
Jason