potting soil in raised bed
If I add potting soil to a raised bed what ratio of potting soil should I use?
I am considering some top soil, black kow, other compost and some potting soil. I saw somewhere 60% topsoil and 30% compost but I am not sure where potting soil fits in. I used a potting soil with topsoil in a flower bed and it worked really good but this time I am building a vegetable garden bed with cinder block. My bed will be 4x10 8 inches high and I will be buying bags from the big box stores to fill in. Long story but I cannot get a load delivered anywhere near where I am building the bed.
Any thoughts on mushroom compost? Lowes has this but I read mix messages about it on the web.