Floribunda, grandiflora, petunias, garden roses and David Austin Roses are present in the Rose Gardens. Ruellia is a genus of flowering plants commonly known as ruellias or wild petunias. Petunias can be cultivated in hanging baskets. Like her mother, she specialized in breeding flowers, including self-seeding double petunias. With my porch and my pillow, my pretty purple petunias. They say it's two petunias past the jimson weed. Before this annual festival, volunteers plant thousands of pink petunias along the main streets. Petunias can tolerate relatively harsh conditions and hot climates, but not frost. In horticulture many terms are used to denote different types of cultivated petunias. They have long stamens; they carry a strong, sweet scent similar to petunias. The larvae feed on "Dipteracanthus bracteatus" and "Ruellia" species (wild petunias).