Description Petunias are so reliable and have such a wide variety of uses that it’s no wonder it’s one of the most popular garden flowers today. It’s simple to buy a couple of petunia seedlings to fill one planter, but for mass plantings and garden edging, growing petunias from seed is the way to go. You’ll save money because of the sheer number of plants you need, plus you’ll have a much wider range of flowers to choose from. Garden centers only carry a few varieties already sprouted and growing, but you can find petunia flower seeds for different sized plants, in almost every color of the rainbow Genus: Petunia Plant Type: Flower Light: Full Sun Bloom Start to End: Early Summer - Late Summer Habit: Compact Plant Height: 8 in - 10 in Bloom Size: 3.5 in