I don't usually like yellow bougies, but yours is very pretty.Repotted it to address very slow drainage issue and put it into a different pot which I think looks better with it (more proportionate, I think). It was very root bound and had one circling root that was about 3 ft. long.
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Mine have much paler flowers inside as well. One that bloomed all winter with really pale pink flowers, now has magenta flowers.It’s normally more orange than yellow, but I only fertilize with Miracle Grow when it’s indoors for the winter and the flowers developed before I brought it outside, so the colors are more muted. When it’s outside, I feed it Bougain and that really brings out vibrant colors during the next bloom.