Key Lime Pie Zinnias are a mix of lime green and white zinnias that will make stunning bouquets. And what a great choice for potted plants, for you cannot find these at the big box stores! You can only get varieties like this when you buy Heirloom flower seeds online. Key Lime Pie zinnias grow in zones three and above; plant after all danger of frost. Be sure to space your seeds about six inches apart and grow like you would any zinnia. Happy growing!!!