definitions/features/scatter_fern_feature.json

{
  "format_version": "1.13.0",
  "minecraft:scatter_feature": {
    "description": {
      "identifier": "minecraft:scatter_fern_feature"
    },
    "iterations": 90,
    "x": {
      "distribution": "gaussian",
      "extent": [ -8, 8 ]
    },
    "y": {
      "distribution": "gaussian",
      "extent": [ -4, 4 ]
    },
    "z": {
      "distribution": "gaussian",
      "extent": [ -8, 8 ]
    },
    "coordinate_eval_order": "zyx",
    "places_feature": "minecraft:fern_feature"
  }
}