If crocuses are the heralds of spring, perhaps petunias signal the start of summer. Growers are developing earlier blooming petunias, and 'Sanguna Radiant Blue' is part of that trend. Neither a deep nor sky blue, this variety has lavender blue petals that blend into a white center, and is classified as bi-colored. Mounding to about a foot tall, 'Sanguna Radiant Blue' will spill over the edge of window boxes and hanging baskets, growing up to two feet long. Adequate sun, water, and fertilizer is the formula for long lasting performance, starting in late spring and continuing on into the fall.