Glossary

Romaine (Cos) lettuce

  • Short definition: Romaine lettuces form tall heads with firm, upright leaves. Also known as Cos lettuces.
  • Botanical classification: Lactuca sativa var. longifolia.
  • Typical varieties: Lobjoits Green Cos, Little Gem, Valmaine.
  • Key features: Very crispy leaves. More heat-tolerant than other types of lettuce.