After all danger of frost has passed and the soil has warmed, sow seeds
1/8" to 1/4" deep in an location that has rich, moist soil and receives
full-sun. Final spacing of plants should be 12 to 18 inches. For earlier
blooming, start seeds indoors in pots, under lights, preferably on a
heat-mat to ensure the soil temperature remains between 75º to 80ºF.
Germination should occur in 10 to 14 days
Informational References:
- "James Vicks Garden and Floral Guide," James Vick, Rochester, New York, 1934