{
  "type": "minecraft:block_column",
  "allowed_placement": {
    "type": "minecraft:all_of",
    "predicates": [
      {
        "type": "minecraft:matching_blocks",
        "blocks": "minecraft:water"
      },
      {
        "type": "minecraft:matching_blocks",
        "blocks": "minecraft:water",
        "offset": [
          0,
          1,
          0
        ]
      }
    ]
  },
  "direction": "up",
  "layers": [
    {
      "height": {
        "type": "minecraft:uniform",
        "max_inclusive": 9,
        "min_inclusive": 0
      },
      "provider": {
        "id": "minecraft:kelp_plant"
      }
    },
    {
      "height": 1,
      "provider": {
        "type": "minecraft:randomized_int",
        "property": "age",
        "source": {
          "id": "minecraft:kelp",
          "properties": {
            "age": "0"
          }
        },
        "values": {
          "type": "minecraft:uniform",
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          "min_inclusive": 20
        }
      }
    }
  ],
  "prioritize_tip": true
}