Because peat moss holds moisture so well, it’s optimal for starting seeds. Preferable if you can start seeds in peat moss substrates for exact plants. Also you can prepare by itself or create a blend using one part peat moss along with one part soil and one part sand or vermiculite. Wet the soil before sowing seeds, and follow the directions for the seeds you have regarding how deep to plant them, as different types of seeds should be planted at varying depths.