Fertilizer:
I always feed mine with compost – a good dose upon planting and a 3 inch topping every late winter/early spring every year or 2.
Water:
Bougainvillea is pretty drought tolerant once established. It prefers a good, deep watering every 3-4 weeks rather than frequent shallow waterings.
Training/Support:
The taller growing bougainvilleas need strong support and require training and to be tied. They aren’t attaching or twining vines.