bought bougainvillea in full bloom ,vibrant pink color, repotted it , the flowers have grown pale in color

Question

planted in a mix of potting soil and 50/50 mix of cow manure and compost – store bought

Answer 1

It probably didn't need repotting yet. They actually like to be a little potbound. And it's usually best to repot when they are between bloom cycles. I think it is just in a bit of shock. Also make sure you didn't go up more than one in pot size. Also check on your watering. Let it start to dry before watering again.

https://www.gardeningknowhow.com/ornamental/vines/bougainvillea/bougainvillea-garden-care.htm

https://www.gardeningknowhow.com/ornamental/vines/bougainvillea

https://www.gardeningknowhow.com/ornamental/vines/bougainvillea/bougainvillea-in-containers.htm