At times, it can be difficult to get a hoya plant to bloom. But supplying yours with the ideal growth conditions gives you the best opportunity for success. One common reason for a hoya plant to fail to bloom is insufficient light. While these plants can live in low light conditions, they need enough light to develop healthy flowers. Altering your fertilization routine is another way to promote more blooms. Phosphorus, for example, is particularly helpful for boosting flower output.