Mutabilis Rose
What makes hibiscus mutabilis change color?
The flower also known as confederate rose or cotton rosemallow
They change color as they get older, due to a change in pH in the petals.
See page 60 of the book linked below.
Mutabilis Rose

How to Keep Indoor Flowers Arranging Fresh
Family flowers arranging have been loved by many people, but how to extend the period and remain bright of flowers arranging, the following have some ways to try:
1, Soaking in sugar
Adding and mixing a little sugar into vase, then insert the flowering branch into vase. As the sugar could give it provides nutrients to prolong flower life.
2, Soaking in brine
Pouring some dilute brine into the vase, and then insert the flowering branch into vase. This method is suitable for a variety of flowers in halophiles, such as plum blossom, lotus, narcissus, camellia, canna and so on.
3, Soaking in beer
First, pouring beer into the vase, adding and mixing some clean water, then insert the flowering branch into vase. As the beer contains alcohol, sugar and other nutrients, it not only can antiseptic disinfect for rhizoma, but also provide nutrients for the flowering branch. This method is most suitable for wisteria, peach blossom, big madder flowers and so on.
4, Pruning flowering branch
Pruning the flowering branch ends incision every day with scissors which can maintain good Bibulous function that keep the flowering branch fresh and extend the flower arranging life.
5, Burning flowering branch
First, burning flowering branch end of the incision 2 cm in the alcohol lamp or a candle for a while, when white liquid outflow from the incision solidified, then plug it into the bottle. This method is most suitable for plum blossom, peach blossom, rose, Lilac, Hibiscus mutabilis, Magnolia, Poinsettia flowers and other hard stems and branches.
6, Scalding flowering branch
Firs, Scalding flowering branch end of the incision 2 cm into the boiling water, and last 12 minutes, then insert it into the bottle. This method is most suitable for peony, phlox, impatiens, tulips and other flower which stem and branches more flexible.
More: Rainbow Rose: Expensive and Happiness Flowers
Ring Pot: A Flower Pot Can Calculate The Age of Bonsai
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What makes hibiscus mutabilis change color?
The flower also known as confederate rose or cotton rosemallow
Most likely a change in pH as the flower ages.
Rose troubles|Daphne Richards|Central Texas Gardener