Gomphrena flower seeds is one of the easiest to sow, germinating well both indoors and outdoors. Darkness is required for germination, so scatter the tiny seeds once all danger of frost has passed and then cover the seeds with a light layer of soil or vermiculite, no more than 1/4-inch. Water thoroughly but gently, keeping the bed consistently moist until the seedlings appear strong and healthy, thinning as needed. Germination normally takes place in 14 to 21 days at temperatures from 70 to 75°F. Once established, Gomphrena is drought tolerant and non-aggressive, even if you allow it to re-sow year after year.