How do I get my Bougainvilleas to flower
I have a lot of vines. They are several years in the ground and keep shooting growth but no flowers. We do not fertilize and only water moderately one time a week. They are in a northern exposure close to the house. They get the am sun but not the intense southern pm sun.
If they are getting enough light (which is the most common reasons for plants failing to flower), then it is likely a lack of phosphorus. Plants need phosphorus to flower. Bone meal is a good source of phosphorus (https://www.gardeningknowhow.com/organic/bone-meal-fertilizer.htm).