how do I turn an original blue hibiscus blue again when it loses its color after planting?

Question

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The color of a hibiscus was blue when I bought it, now it is a nondescript greyish color after planting.

Answer 1

This article explains it:

https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-turning-different-color.htm