Last year my garden had Mel’s Mix. This year I added compost. The “expert” told me to use mushroom compost.
If Mushrooms are a vegetable.......
I've done Mel's Mix, both in smart pots, and in the regular garden. To Me, it seemed like the mushroomc ompost dries out really fast.
Being lazy, I have decided I like just using straight up Black Gold Potting Mix. In my regular garden where I'd groen tomatoes last year, I removed the soil down about six inches, and put in the black gold potting mix. It really holds the water plus it has earthworm castings in it which seem pretty good.
My tomatoes look great, but stopped setting fruit when the temps got into the mid nineties with no cloud cover during the day... Now that it was slightly cooler with some humidity, I am seeing some marble sized tomatoes.