I buy mushroom compost from Miami Oklahoma. It has chicken manure in it and what looks like grass or hay. I have rotten straw bales around and what is in the mc is not stemy like straw. I use it for a mulch because it doesn't have weed seeds. I wouldn't even try it in a pot except a little on top, but I would put it in a raised bed. The materials you are using would work in a raised bed. How I would know if it wasn't working is the plants would die. If they live and you get tomatoes you did well.
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