Guaranteed to make a dramatic effect, the bold and dark red color of the Black Surprise Large Flowering Gladiolus is a "must-have" for the Gladiolus fan.When planted is staggered over several weeks in Spring they will bloom in succession over a period of several weeks in late Summer, the tall flower stems will create an amazing backdrop to your summer garden. Its sword-like foliage will also add amazing texture which will stay green all summer long.