I did OK with a few Black Beautys in pots last year. Your pot size sounds larger than mine. The one I had in ground did the best though, and only after a long time. Apparently BBs require a long growing season.

Not sure what to tell you on the potting mix. Sounds OK.

The container is large enough. I grew black beauty last year. 2 plants in a container 8" deep and I forget the exact dimensions, but around 24" long and 14" wide.

One tip with eggplants is do *not* put them outside if they will see temps below 55F even briefly. Eggplants are a plant that once hit by the cold may not show obvious signs, but it's growth and development will be adversely affected for it's entire lifespan. They are definitely a warm/hot weather only plant.

Don't know anything about the mix you are looking at, but it's probably fine for eggplant. After a season of growing maybe check back in and read through some of the posts (good winter activity) and you will find a wealth of knowledge you can apply the following season.

Justaguy2, Thanks for the tip! Paul