Variations 
Cabbage Lettuce forms green outer leaves that spread up to 380mm (15in) wide and consist of a tightly compressed pale-green leafed central ball.

Loose-Leafed Lettuce produces tender bright green rounded leaves arranged in rosettes up to 300mm (12in) across.

Butterhead Lettuce is composed of a softly compressed head up to 300mm (12in) wide with waxy light green outer leaves and pale green to yellow inner leaves.

Cos or Romaine Lettuce is a summer variety that forms an upright growth habit with oblong leaves 'Green Cos'.

Asparagus Lettuce forms a thick stem with narrow oblong leaves that may be removed individually and soon goes to seed during summer. 

Cultivars 
'Black Seeded Simpson'
This is a loose leaf type that is popular and has a high vitamin 'C' content.

'Bubbles'
This cos variety produces blistered leaves that has a nutty flavour.

'Frisby'
This cabbage type produces a tight ball shape with crinkly leaves.

'Green Salad Bowl'
This loose leaf variety grows well during summer and has bright frilly green leaves.

'Iceberg'
This cabbage lettuce forms a tight ball of crisp leaves and is a popular cultivar.

'Lakeland'
This cabbage lettuce forms a tight ball of crisp leaves simular to 'Iceberg'.

'Great Lakes'
This ornamental cultivar has no solid hart and consists of loose leaves and may be grown as an edging plant.

'Lollo Rossa'
This loose leaf variety has reddish frilly leaves and may be cut throughout the year.

There are many varieties of lettuces and please contact your local nursery for the current available cultivars.