Bacopa plants need a lot of sunlight and require a lot of water. Bacopa plants are native to tropical and sub-tropical regions, so they require warm temperatures as well.
In U.S. Department of Agriculture hardiness zones 6, 7 and 8, Bacopa plants need 10 hours of direct sunlight a day. Heavy watering every other day is sufficient. The soil needs to drain well with sand as the bottom third of the potting medium. The bacopa plant requires an average temperature of 80 degrees Fahrenheit and cannot withstand temperatures lower than 60 degrees Fahrenheit.
Some species of bacopa can be grown submersed in water. The species Bacopa myriophylloides is a popular aquatic plant that can be grown in aquariums as long as sufficient light is present.