{
  "schema_version": 1,
  "record_type": "plant",
  "slug": "lettuce",
  "common_name": "Lettuce",
  "botanical_name": "Lactuca sativa",
  "family": "Asteraceae",
  "summary": "Lettuce is a compact cool-season leaf crop that rewards succession sowing, steady moisture and varieties selected for the temperature and day length of each planting window.",
  "categories": [
    "leafy vegetable",
    "cool-season crop",
    "container crop"
  ],
  "growth_habits": [
    "loose-leaf",
    "butterhead",
    "cos",
    "crisphead"
  ],
  "lifecycle": "Annual",
  "difficulty": "Easy",
  "requirements": {
    "light": {
      "minimum_direct_sun_hours": 4,
      "preferred_direct_sun_hours": 6
    },
    "soil_ph": {
      "minimum": 6.0,
      "maximum": 7.0
    },
    "container": {
      "minimum_volume_litres": 10,
      "minimum_diameter_cm": 30,
      "plants_per_container": 4
    },
    "spacing": {
      "minimum_cm": 15,
      "maximum_cm": 30
    },
    "planting_out": {
      "minimum_reliable_temperature_c": 5,
      "frost_tolerant": true,
      "label": "Sow or plant",
      "note": "Young plants tolerate light frost"
    },
    "harvest": {
      "typical_uk_months": [
        "April",
        "November"
      ]
    }
  },
  "sources": [
    {
      "id": "rhs-growing-lettuce",
      "publisher": "Royal Horticultural Society",
      "url": "https://www.rhs.org.uk/vegetables/lettuce/grow-your-own",
      "supports": [
        "types",
        "sowing",
        "spacing",
        "containers",
        "bolting",
        "harvest"
      ]
    },
    {
      "id": "umn-growing-lettuce",
      "publisher": "University of Minnesota Extension",
      "url": "https://extension.umn.edu/vegetables/growing-lettuce-endive-and-radicchio",
      "supports": [
        "cool_season",
        "soil",
        "sowing",
        "watering",
        "problems"
      ]
    }
  ]
}