Remove the weeds from the planting site after the last frost has passed and the soil is warm. The site should have well-draining soil and full sun.
Loosen the soil with a shovel. Insert the seeds into the soil until they are covered, spacing them 18 to 24 inches apart.
Water until the soil settles. Continue watering frequently enough to keep the soil moist but not water-logged. The seeds should germinate in one to two weeks.
Apply a general-purpose fertilizer to the soil around the plants once a month during the growing season. Follow application instructions on the package.
Deadhead the flowers during the growing season. This involves pulling off faded blooms to encourage the plant to continue producing flowers.