98-105 days. Dreams Series pelleted petunia seeds are an essential and timeless grow in your garden, home, or patio for early spring brilliance. Dreams Series petunias are easy to grow from seed and promise durable 10-15 inch tall semi-dwarfed mounds native to the warm tropics of South America. Dreams Series petunia seeds will bloom year-round in warm winter climates and are an ideal grow to accent decorative planters, window boxes, or hanging baskets. Dreams Series petunias are classic and internationally celebrated as an herbaceous perennial across a variety of hot and humid North American gardens. Pelleted seeds.