I have a fairly large area (maybe 4 feet by 4 feet or more) and when they bloom it looks like an ethereal cloud of the most heavenly shade of blue! They are not nearly as effective in twos or threes, etc. They are in a full sun area and survive the hot dry weather with no extra care. They also are nice if cut and let to dry. The color fades, but they are unique in a tall vase.