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Seeds germination period requires one to two weeks. Start them indoors four weeks before the last frost or sow them directly outdoors in warm weather.Cover the seeds with a thin layer of soil and keep the soil evenly moist until the seeds germinate. By adding a high nitrogen fertilizer, planting process can get a headstart.Ideal plant spacing is ten inches apart.Shear or pinch the plants if it produce black seeds, to promote more blooms.