Sow the seeds on the soil surface in individual 2- to 3-inch diameter pots. Cover the seeds with a 1/8-inch layer of soil.
Place the pots in a warm, 70 to 75 degree Fahrenheit location where they receive bright but indirect sunlight. Water the soil in the pots so it remains evenly moist. The seeds germinate within 7 to 12 days.
Transplant the Chinese lantern seedlings outdoors one to two weeks after the last spring frost. Plant the seedlings in a well-drained, full sun bed. Space the plants 24 to 36 inches apart.
Water the plants once weekly. Provide enough irrigation to moisten the top 6 inches of soil. The plants require more frequent irrigation during drought periods if the soil begins to dry more quickly.
Mulch over the planting bed with a 2-inch layer of bark or similar organic mulch. Mulch prevents the soil from drying too quickly and helps prevent weed competition.