Annual plants are those types that grow from a seed, produce foliage and die off in a single growing season. Annual plants die after the first hard frost in fall, and do not grow back the following spring. You can collect seeds from the seedpods that form on annuals and plant them in spring.
Snapdragons are annual plants that produce spikes of colorful flowers during the summer growing season. The plants are available in several heights from dwarf to tall. The height of the snapdragon ranges from 6 to 15 inches, with the flower being the top of the plant.
Snapdragon plants produce flower in all colors, except blue. The flowers form seedpods when they dry and fall off. Collecting the seedpods allows you to dry the seeds and store them over winter for planting in the spring.