Petunia are one of the most popular annual summer plants. Their Bright colour, lovely scent, flower richness makes them ideal for use in beds, borders and containers.Growing petunias can offer long term color in the summer landscape and brighten dreary borders with lovely pastel colors. Proper petunia care is simple and easy.Petunias need full sun or they will become spindly. They don’t tend to flower in the shade.