PETUNIA - FROST SERIES (PELLETED) 15 inches. Even white edges on all 3 to 3 ½ inch blooms make these bicolors great eye-catchers. Petunias continue to rank among the most popular flowering annuals. They're bright and lively, bloom from spring until frost, and scent the air with lovely fragrance. Best of all, they're amazingly easy to grow, both in the garden and in containers. Season: Annual USDA Zones: 3 - 8 Height: 15 inches Bloom Season: Late spring through fall Bloom Color: Red Environment: Full sun to partial shade