GOMPHRENA Annual 11,000 seeds/oz Sow seeds in March in a good soil substitute, like Berger BM-2. Press seeds into soil and cover with 1/4″ of soil. Germinate at 80°F daytime and 70°F nighttime for 14 days. Seeds must be germinated in total darkness. Gomphrena has a low germination rate of only 40-50%. Never over water. In midsummer plant outdoors in sun. Space 12″ apart.