Fill your beds, baskets, and containers with the charming, jewel-like flowers of bacopa. This vigorous trailing annual grows only 4 to 8 inches high, but in ideal conditions will cascade up to 4 feet long. Bacopa flower colors include blue, white, and lavender. You can also use bacopa as a quick, colorful groundcover. Like other annual flowers, bacopa will die back when temperatures dip below freezing.