When the flower buds emerge I water more regularly. I eventually bring
them in the house a few weeks before I want them to flower. The best results by far have consistently been when it was left out in a pretty warm spot with sun much of the day, and as soon as we bring it back indoors the flower buds appear within a few days. I've had it for several years and it is perfectly healthy. It lives on the mantelpiece of a south facing lounge.