98-105 days. Supercascade Series seeds will delight your garden with the largest and most robust single-blooming petunias available. Supercascade seeds mature as tidy 12-15 inch petunias while exploding with enormous 4-5 inch heads ideal as a fragrant ground cover but still delicate enough to accent seasonal baskets, bouquets, or arrangements. Supercascade Series seeds grow early blooming petunias that promise to keep butterflies, bees, and other important pollinators humming from Spring all the way until the frost. Supercascade petunias are easy to grow from seed and provide an elegant trim along rock gardens, flower beds, and walkways. Pelleted seeds.