{
  "type": "minecraft:random_patch",
  "config": {
    "feature": {
      "feature": {
        "type": "minecraft:simple_block",
        "config": {
          "to_place": {
            "type": "minecraft:weighted_state_provider",
            "entries": [
              {
                "data": {
                  "Name": "minecraft:grass"
                },
                "weight": 1
              },
              {
                "data": {
                  "Name": "minecraft:fern"
                },
                "weight": 4
              }
            ]
          }
        }
      },
      "placement": [
        {
          "type": "minecraft:block_predicate_filter",
          "predicate": {
            "type": "minecraft:matching_blocks",
            "blocks": "minecraft:air"
          }
        }
      ]
    },
    "tries": 32,
    "xz_spread": 7,
    "y_spread": 3
  }
}