Most flowers included have 2nd Year Maturity. The Fall Planting Perennial assortment features 5 classic flower seeds for easy fall sowing. Fall planting is not just for bulbs! Plant these seeds in the fall to take advantage of the natural cool season to stratify these seeds. Stratification is the process of signaling the germination of seeds in the spring after a cold winter. This is the natural cycle seeds of native plants, many perennials, and wildflowers follow for strong plants all season long.