Lettuce, Lettuce 'Chartwell', Lactuca sativa var. romana, L-R lettuce chartwell, Yugoslavian red, Analena, all growing in allotment.

Lettuce, Lettuce 'Chartwell', Lactuca sativa var. romana, L-R lettuce chartwell, Yugoslavian red, Analena, all growing in allotment.

Lettuce, Lettuce 'Chartwell', Lactuca sativa var. romana, L-R lettuce chartwell, Yugoslavian red, Analena, all growing in allotment.

Lettuce, Lactuca sativa, Mixed varieties growing outdoor in soil.

Lettuce 'Little gem pearl', Lactuca sativa 'Little gem pearl', Aerial view of lettuces growing outdoor.

Lettuce 'Little gem pearl', Lactuca sativa 'Little gem pearl', Aerial view of lettuces growing outdoor.

Lettuce 'Little gem pearl', Lactuca sativa 'Little gem pearl', Aerial view of lettuces growing outdoor.

Lettuce, Lactuca sativa, Close up of mixed varieties.

Lettuce 'Arctic King', Lactuca sativa 'Arctic King', Close up aerial view of green salad vegetable.

Lettuce 'Fristina', Lactuca sativa 'Fristina', Close up aerial view of green salad vegetable.

Lettuce, Lactuca sativa, Close up aerial view of green salad vegetable.

Lettuce 'Fristina', Lactuca sativa 'Fristina', Close up aerial view of green salad vegetable.