I found out that mushroom compost works great for growing lettuce and spinach too. Best crop ever this year was planted in a bag of mushroom compost.Thanks greeneyes... The lettuce and spinach were grown only in mushroom compost?
Yep. I did an experiment. Took a bag of M.R.Compost and poked holes in it. Turned over and cut out a rectangle around the top. Bag was about 2x2.5 feet. Took a bag of top soil and did the same, kept it close by. In between, I mixed half Mel’s mix and half M.R.Compost together. Compost was the winner by a landslide. Mixture was second place and top soil lost big time.