Petunia (Petunia Multiflora F2 Star Mix) - Multiflora Star Petunia flowers have a crisp look and are good for beds, hanging baskets, window boxes and tubs. Start Petunia Multiflora seeds for brilliant long-lasting color. The Star Petunia plant will not disappoint you, and its flowers feature a white central star inside each brightly colored trumpet-shaped bloom. Petunias are a good choice for fall and winter planting in warm, frost-free zones. In colder regions, plant the flower seeds indoors for transplanting out after danger of frost has passed in the spring.When planting outdoors, pinch the young seedlings back to encourage branching. Petunia flower care includes regular fertilization and deadheading the spent blooms. With care, these Petunia flowers will perform all season long.