What veggies grow well in southern "red clay soil" ?

Answer 1

Find gypsum in a bag-- turn the clay, sprinkle the gypsum and watch it break the clay into pieces-- then you can mix in compost-- at this time of the year, you could probably mix in leaves ( thinly), shredded paper (newspaper is good)-- and with enough moisture should be ready by april to plant.
The clay has what plants need but it's locked into a tight structure-- the combination of gypsum and compost/mulch will work wonders-- just not all at once.
good luck

Answer 2

the bad thing about clay is, when its wet its wet and when its dry its dry. I would try to amend it with some compost before planting in it. squash, zucc., tomatoes, okra,.... you never know Im surprised to find where stuff grows sometimes!! definitely use compost though, try cotton burr compost it works great for me.