The Cat Whiskers is a very showy plant that grows 3-4ft tall with bluish-white flowers that look like whiskers. The flowers of the Cat Whiskers are a lovely lavender color and are great to use as cut flowers. White Cat Whiskers appear to be fragile, but they are tough in a stressful environment. Cat Whiskers are a favorite target for butterflies. Orthosiphon stamineus flowers bloom from the bottom upward ans will continue to bloom if cut and placed in a vase.