Get a head start on spring with our favorite varieties to sow indoors this winter. These easy-to-grow seeds thrive under lights or on a sunny windowsill, giving you strong, healthy plants ready for transplant when the weather warms. From cheerful blooms like Cosmos, Zinnias, Calendula, Snapdragons, Asters, and Echinacea to garden essentials like Romaine Lettuce and Cherry Tomatoes, these selections are perfect for gardeners eager to watch life unfold early. Begin your growing season now and enjoy vibrant color and fresh harvests long before spring arrives.