Bougainvilleas won’t bloom

Question

Have five bougainvillea plants in the ground for approx 10-12 yrs and they either don’t bloom or bloom really late in the summer. Have tried fertilizer BR61 with little effect. They are in full sun.

Answer 1

Here's an article that will answer your question:

https://www.gardeningknowhow.com/ornamental/vines/bougainvillea/bougainvillea-not-blooming.htm