Growing zinnia plants from seed is an easy method to introduce some color into your garden. Select a location that receives plenty of sun and loosen the soil prior to planting. The zinnia seeds should be planted a little more than a quarter-inch deep, based on the guidelines provided on the seed packet. The seed sowing process should be done outside when it is warm and there is no chance of frost, because zinnias are unable to survive in freezing temperatures. Provide water to keep the soil moist without soaking it while the seeds germinate. Seedlings usually emerge within five to ten days. When the plants mature, give them enough room for proper air circulation. Gardyna provides gardening tips that may assist beginners in planting and taking care of their flowering plants.