{
  "variants": {
    "stage=0": [
      { "model": "minecraft:custom/sapling/birch/0" },
      { "model": "minecraft:custom/sapling/birch/0", "y": 90 },
      { "model": "minecraft:custom/sapling/birch/0", "y": 180 },
      { "model": "minecraft:custom/sapling/birch/0", "y": 270 }
    ],
    "stage=1": [
      { "model": "minecraft:custom/sapling/birch/1" },
      { "model": "minecraft:custom/sapling/birch/1", "y": 90 },
      { "model": "minecraft:custom/sapling/birch/1", "y": 180 },
      { "model": "minecraft:custom/sapling/birch/1", "y": 270 }
    ]
  }
}