Water stress in lettuce

As a fast-growing crop with shallow roots, lettuce is susceptible to stress, which often shows up as angular midribs on the outer leaves, rather like elbows.

- BILL KERR

These may not be severe enough to downgrade the crop, but they are a warning. In a spell of more severe weather, the damage may be worse.

There are many varieties of lettuce, with new ones being added from time to time. When trialing a new variety, plant it in a small area and examine it closely for adaptability to the climate and conditions in your area. How you grow the lettuce also matters; one farmer may have great success with a particular variety while another farmer in the same area may end up with a failed crop. The way the crop is irrigated and cared for can make all the difference.