Hello I have purchased many different bags of potting soil. Including Professional potting mix with fertilizer. Miracle grow garden andÂ Flower N-0.15 - P-0.05 - K-0.10. Â Shultz moisture control, Vermiculite, and sheep compost : 2.0 2.50 1.00 can I start seedlings with a mixture of these potting soil? Will they not grow? I also planned on mixing this with some regular dirt.