Romaine lettuce is also commonly known as cos lettuce. It produces a large, tall, and upright loose head of elongated leaves with a thick midrib and sweet flavor. While most well-known for long ...

Apart from traditional lettuces, such as 'Cos', 'Iceberg' and 'Butterhead', there are many others to try, including loose-leaf types and oak leaf lettuce, radicchio, rocket and endive.