In an area that gets full sun, dig compost into the soil; water the bed thoroughly. Sow seeds 1/2 inch apart. Seeds are small; to help distribute them thinly over the soil, mix them with clean sand before broadcasting. Cover the seed with 1/4 inch of fine soil.
Spray the seedbed very lightly with water, then keep the soil evenly moist during growth.
Drape a canopy of netting over the seedbed. Extend the season into summer by hanging shadecloth (available at most nurseries) over the bed.
1. Thin seedlings when they've reached 1-2 inches tall.
Using small, pointed scissors, cut out individual plants (toss thinnings into salads). Or use a chopstick to gently pry up crowded seedlings, then transplant them in bare spots where seeds didn't germinate.