{
  "schema_version": 1,
  "record_type": "plant",
  "slug": "celeriac",
  "common_name": "Celeriac (celery root)",
  "botanical_name": "Apium graveolens var. rapaceum",
  "family": "Apiaceae",
  "summary": "Celeriac is a long-season celery relative grown for its knobbly swollen stem base and needs an early indoor start, fertile soil and uninterrupted moisture.",
  "categories": [
    "stem vegetable",
    "winter crop",
    "container crop"
  ],
  "growth_habits": [
    "rosette",
    "swollen stem base",
    "upright"
  ],
  "lifecycle": "Biennial usually grown as an annual",
  "difficulty": "Moderate",
  "requirements": {
    "light": {
      "minimum_direct_sun_hours": 4,
      "preferred_direct_sun_hours": 6
    },
    "soil_ph": {
      "minimum": 6.0,
      "maximum": 7.0
    },
    "container": {
      "minimum_volume_litres": 20,
      "minimum_diameter_cm": 30,
      "plants_per_container": 1
    },
    "spacing": {
      "minimum_cm": 30,
      "maximum_cm": 30
    },
    "planting_out": {
      "minimum_reliable_temperature_c": 10,
      "frost_tolerant": false,
      "note": "Harden off and plant after frost risk has passed; young plants exposed to prolonged cold may bolt, although mature roots are winter hardy."
    },
    "harvest": {
      "typical_uk_months": [
        "October",
        "March"
      ]
    }
  },
  "sources": [
    {
      "id": "rhs-growing-celeriac",
      "publisher": "Royal Horticultural Society",
      "url": "https://www.rhs.org.uk/vegetables/celeriac/grow-your-own",
      "supports": [
        "identity",
        "light",
        "sowing",
        "temperature",
        "spacing",
        "planting",
        "watering",
        "crop_care",
        "problems",
        "harvest_window",
        "storage"
      ]
    },
    {
      "id": "uky-celery-celeriac-profile",
      "publisher": "University of Kentucky Center for Crop Diversification",
      "url": "https://ccd.uky.edu/sites/default/files/2024-11/ccd-cp-092_celery-and-celeriac.pdf",
      "supports": [
        "soil_ph",
        "soil",
        "sowing",
        "planting",
        "watering",
        "bolting"
      ]
    },
    {
      "id": "umaine-celeriac-trial-2022",
      "publisher": "University of Maine Cooperative Extension",
      "url": "https://extension.umaine.edu/highmoor/resources-by-crop/celeriac/evaluation-2022-research-report/",
      "supports": [
        "botanical_name",
        "growth_habit",
        "spacing",
        "crop_development",
        "harvest"
      ]
    },
    {
      "id": "iastate-winter-storage",
      "publisher": "Iowa State University Extension",
      "url": "https://yardandgarden.extension.iastate.edu/how-to/storing-winter-storage-vegetables",
      "supports": [
        "harvest",
        "storage"
      ]
    },
    {
      "id": "ucanr-container-basics",
      "publisher": "University of California Agriculture and Natural Resources",
      "url": "https://ucanr.edu/node/137197/printable/print",
      "supports": [
        "container_depth",
        "container_care"
      ]
    }
  ]
}