A. Iris could not be used as filler for the flower arrangement.
Client needs blue-purple and yellow flowers that lives for at least 5 days.
Iris, has petals with colors blue, yellow, purple, and white. But, it has a vase life of 2 - 5 days maximum. Its water must be treated to achieve the maximum vase life of 5 days.
Asters, the Novi-Belgii variety, has petals with in shades of lavender, pink, white and blue, but all with yellow centers. It has a vase life of 6-7 days.
Statice is lavender and can last upto 14 days.
Gypsophila, though abundantly found in white color and light pink colors, it can also be ordered in blue-purple color with a vase life of at least 7 days.