{
    "format_version": "1.21.90",
    "minecraft:item": {
        "description": {
            "identifier": "wiki:custom_seeds", // Make sure this is different from your crop's ID.
            "menu_category": {
                "category": "nature",
                "group": "minecraft:itemGroup.name.seed"
            }
        },
        "components": {
            "minecraft:icon": "wiki:custom_seeds",
            "minecraft:block_placer": {
                "block": "wiki:custom_crop" // The block this item is placing.
            }
        }
    }
}