{
  "schema_version": 1,
  "record_type": "plant",
  "slug": "onion",
  "common_name": "Onion",
  "botanical_name": "Allium cepa",
  "family": "Amaryllidaceae",
  "summary": "Bulb onions need full sun, free-draining soil, shallow weed-free cultivation and a variety whose day-length response matches the growing region.",
  "categories": [
    "bulb crop",
    "cool-season crop",
    "storage crop"
  ],
  "growth_habits": [
    "long-day",
    "intermediate-day",
    "short-day"
  ],
  "lifecycle": "Biennial, grown as an annual",
  "difficulty": "Easy",
  "requirements": {
    "light": {
      "minimum_direct_sun_hours": 6,
      "preferred_direct_sun_hours": 8
    },
    "soil_ph": {
      "minimum": 6.0,
      "maximum": 7.0
    },
    "container": {
      "minimum_volume_litres": 15,
      "minimum_diameter_cm": 30,
      "plants_per_container": 6
    },
    "spacing": {
      "minimum_cm": 10,
      "maximum_cm": 15
    },
    "planting_out": {
      "minimum_reliable_temperature_c": 5,
      "frost_tolerant": true,
      "label": "Sow or plant",
      "note": "Young plants tolerate light frost"
    },
    "harvest": {
      "typical_uk_months": [
        "July",
        "September"
      ]
    }
  },
  "sources": [
    {
      "id": "rhs-growing-onions",
      "publisher": "Royal Horticultural Society",
      "url": "https://www.rhs.org.uk/vegetables/onions/grow-your-own",
      "supports": [
        "sets",
        "seed",
        "spacing",
        "watering",
        "harvest",
        "storage"
      ]
    },
    {
      "id": "umn-growing-onions",
      "publisher": "University of Minnesota Extension",
      "url": "https://extension.umn.edu/vegetables/growing-onions",
      "supports": [
        "day_length",
        "soil_ph",
        "moisture",
        "harvest",
        "curing"
      ]
    }
  ]
}