Plant African daisies directly in the garden in spring. African daisies are cold-tender, so be sure any danger of frost has passed. Choose an area where the plants will be exposed to bright sunlight.
Work the top 4 to 6 inches of the soil with a hoe or spade. Plant the carnation seeds about 4 inches apart, then cover the seeds with a light dusting of soil, no more than 1/8-inch deep.
Water the seeds carefully, using a hose with a spray-mist attachment or a watering can with small holes. Until the seeds germinate, they will wash away easily.
Thin the African daisies when the seedlings are about 1 inch tall. Allow 10 inches between each seedling.
Keep the soil damp for the first few weeks, until the plants are well-established. African daisies are drought-tolerant plants, and once established, will require irrigation only during hot, dry weather.
Fertilize African daisies once every month, using a general purpose liquid or granular fertilizer. Read the fertilizer package for specific directions.
Remove wilted blooms regularly. Removing spent blooms will prevent the plant from going to seed too early, and will promote the African daisy to continue blooming until the end of summer.