Scatter seeds so they’re about 1/2 inch apart in a container, that’s at least a foot wide and half as deep, filled with well-draining potting soil.
Cover seeds with ¼ inch of soil, and sprinkle lightly with water to avoid disturbing seeds.
Set in a sunny spot.
Water to keep soil moist.
Snip mesclun with shears when leaves reach 4 to 6 inches tall, about 30 to 40 days after planting. (For best flavor, do this just before eating.)
When clipping, leave 1 to 2 inches of the plants in the ground so that they regrow for another harvest.
Feed with an organic fertilizer after shearing.