A seed plant is a plant that reproduces by generating and dispersing seeds. Gymnosperms, or flowering plants, and angiosperms, or non-flowering plants, are common names given to the two common categories of seed plants.
Magnolias, marigolds, sunflowers and carnations are examples of flowering seed plants. Seeds for these flowers are popular for plantation in home gardens. They also spread seeds and reproduce in the wild. Pines, firs and Japanese ciders are a few examples of non-flowering seed plants. Many gymnosperms populate forests. Large conifer gymnosperms provide oxygen, which is essential to clean air and healthy breathing, explains GardenGuides.com.