Some southern gothic tropes have been around so long that writers treat them like furniture they inherited. Here are some things I keep coming back to about what the good ones actually get right.
The South in southern gothic isn't a setting. It's a condition. The heat, the kudzu, the collapsing porches, the churches on every corner. When a writer treats those details as decoration, you can feel it immediately. When a writer treats them as pressure, as the weight of a place that won't let anyone forget what happened there, the prose starts to breathe differently.
Cormac McCarthy's Suttree is set among outcasts living on houseboats in 1950s Knoxville, and there's almost no plot to speak of. A man drinks. He fishes. He watches people die. The whole book is structured like a river, slow and indifferent, and the horror isn't in any single event. It's in the accumulation. McCarthy understood that southern gothic tropes don't need a haunted house. Sometimes a river full of sewage and a man who refuses to go home is enough.
The convention I see new writers get wrong most often is the grotesque. They think it means ugly. It doesn't. Flannery O'Connor's grotesques are people whose interior lives have become so pressurized by their circumstances that something about them has grown out of proportion. A belief. A desire. A wound they can't stop picking at. The grotesque character isn't there to shock you. They're there to make you uncomfortable about recognizing something true.
Religion in southern gothic is never simple and it should never be played for irony alone. The best writers in this tradition understand that faith in the South is simultaneously a source of genuine comfort and a weapon used against the vulnerable. If your preacher character is only a hypocrite, you've written a cartoon. If your preacher character is a hypocrite who also genuinely believes, you've written something worth reading.
Dorothy Allison said, "Two or three things I know for sure, and one of them is that telling the story all the way through is an act of great courage." She was talking about writing Bastard Out of Carolina, a novel where the violence is domestic, specific, and so close to her own life that the distinction between fiction and memoir barely holds. That kind of proximity is one of the most important southern gothic conventions. The writer isn't observing the South from a safe distance. The writer is from there, and the page smells like it.
Decay is the genre's native metaphor. But the decay that matters isn't the crumbling plantation or the rusted truck in the yard. It's moral decay, social decay, the slow collapse of something that was already rotten at the foundation. The physical rot is just the visible surface of a much older problem.
Harry Crews grew up in Bacon County, Georgia, and his characters eat cars, handle snakes, and build their entire identities around their bodies. There's a carnival energy to his work that nobody else has replicated. Crews proved that southern gothic tropes don't have to be solemn. They can be manic, wild, almost funny, and still arrive at something devastating.
I'm not entirely sure why family secrets work so well in this genre, but I have a theory. The South is a culture built on manners, on what you say and don't say in public. Every family has an official story and an actual story. Southern gothic is what happens when the actual story starts leaking through the floorboards.