Purple blooms are prized by butterflies and hummingbirds Height at shipping is approximately 7-inches tall, measured from the bottom of the pot to the top of the plant. Ships in a 3.5-inch diameter grower pot. Grow Petunia in full sun outdoors for the best growth and enjoy! Water Petunia with approximately 2-3 cups of water about once a week. Adjust as needed for your environment.