Black petunias have high cold hardiness, so they can handle the weather better and provide longer lasting color. Easy to plant: Press the seeds into the soil and lightly cover with peat moss. Darkness aids germination, so it's best to shade the fermentation tray. Germination usually occurs within 21 days at 65 - 70F. Sowing rate: 2-3 seeds per plant. Start seeds indoors 4-6 weeks before the last expected frost. For spring blooms, it's best to start seeds indoors in late winter. Grows in full sun to partial shade and in moist, well-drained soil. Black Petunia Seeds for Planting - 350+ Petunia Flowers Seeds Garden Hanging Baskets Flowers Annual Petunia Plant Seeds