To understand the blooming cycle, one must understand the mechanism of bract development.
To produce the next flush of color, the plant needs a few weeks to put out new green stems. Since bracts only grow on new wood, this "rest" period is vital for a year-round display. 4 Secrets to Year-Round Color do bougainvillea bloom year round
Overwatering is the number one reason bougainvillea stop blooming. These plants are drought-tolerant and actually bloom better when they are slightly stressed. To understand the blooming cycle, one must understand
Trim back the ends of the branches by a few inches. This forces the plant to branch out, creating more "new wood" where future bracts can form. To understand the blooming cycle