House Plant Seeds Ferns, Succulents & Exotic Foliage Perennial Wildflower Seed Mix (15 Varieties) 1,000 Seeds Carrots will sprout in 3 days if you sow them like this! The Best Grass Seed For Florida Nature's Seed Plant your poppies when it's cold! Poppy seeds require a period of cold to germinate and grow, so they generally do best when planted in the late fall or early spring.