{
  "format_version": "1.13.0",
  "minecraft:single_block_feature": {
    "description": {
      "identifier": "minecraft:fern_feature"
    },
    "places_block": {
      "name": "minecraft:tallgrass",
      "states": {
        "tall_grass_type": "fern"
      }
    },
    "enforce_survivability_rules": true,
    "enforce_placement_rules": false,
    "may_replace": [
      "minecraft:air"
    ]
  }
}