Petunia NC Mix - Flower SeedsOverview The petunia mix flowers form an amazing cascade and have a blooming character that lasts for a long period of time. Therefore they are used in flower boxes and hanging containers that display effectively the beauty of these flowers. The petunia mix seeds grow best when they have access to full sunlight. They can grow well in moderate sunlight too, however it is necessary to ensure that they get sufficient light for them to bloom. There are