Surfinia petunias are the go-to petunia when we want long trailing, colorful petunias. 'Surfinia Giant Blue' petunias are indeed giant and a deep, almost purplish blue. When planted in hanging baskets, Surfinia petunias will literally hide the baskets and often grow well beyond the base of the containers. These petunias were developed to look their best in spite of rain or heat, so grow them in a sunny location, water and fertilize regularly, and enjoy the results.