Instead, she recommends selecting heirloom or open-pollinated varieties of lettuce to harvest seeds from. Amy also advises ...

If you pick the older and outer leaves little and often the inner leaves continue to grow and it allows you to harvest lettuce every week. Remove each leaf with a sharp knife, or by pinching ...

Harvest leaves from cut-and-come again ... Butterhead', there are many others to try, including loose-leaf types and oak leaf lettuce, radicchio, rocket and endive.