peytonplayz585-shadow-3.0/desktopRuntime/resources/assets/minecraft/blockstates/nether_wart.json

{
    "variants": {
        "age=0": { "model": "nether_wart_stage0" },
        "age=1": { "model": "nether_wart_stage1" },
        "age=2": { "model": "nether_wart_stage1" },
        "age=3": { "model": "nether_wart_stage2" }
    }
}