Miniature Succulent Garden Ideas Succulents and Sunshine Watercolor cactus and succulent set on Yellow Images Creative Store 19019 Prairie Smoke Flower Seeds Blue Pumpkin Seed Co When to Start Cucumber Seeds Indoors:Expert Tips for Success 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.