***Warning: This is how I sow my garden. This method may or may not work for you. I am NOT saying that any other way is wrong. This is what works for ME. I am providing this information so that others can have a starting point for their garden. I do not guarantee that this will work or that you plants will grow.***
Sewing lettuce is exactly like sewing spinach. I found a lettuce that grows like grass. I can harvest it by cutting it, and it will continue to grow.
Dig your ditch. I dug four of them. I am just plating lettuce in them. I have amazing gardening friends that plant salad rows. They mix their lettuce, spinach, carrots and radishes in together. I always fail when I try to do this so.......... I do it this way.
Add you seeds, cover with soil and water. Lettuce is done. Easy right??
Good Luck and Happy Gardening!