{
    "variants": {
        "": [
        { "model": "block/fern", "weight": 30 },
        { "model": "block/foliage/fern/fern1", "weight": 20 },
        { "model": "block/foliage/fern/fern2", "weight": 10 },
        { "model": "block/foliage/fern/fern3", "weight": 10 }
        ]
    }
}