Sophistica Blackberry Petunia Petunia is a striking burgundy trumpet-shaped flower. Its pointy leaves remain green in colour throughout the season. Trim off the flower heads after they fade and die to encourage more blooms late into the season. It is a good choice for attracting butterflies to your garden, Petunias have a light sweet smelling fragrance which is unmistakable .absolutely beautiful in full bloom, perfect in hanging baskets. They love full sun but are happy to tolerate some shade. Annual so it will die back with heavy frost.