Hi eveylnatran,
I'm not aware of how a rose might represent or symbolize human hair.
But you have an interesting research question (If a shampoo can protect a rose will it protect hair?). To work on this question you'd need to define and measure the damage the shampoo is supposed to prevent. And design an appropriate experiment to test roses and hair for damages with and without shampoo.
By the way, there is a Science Buddies project about shampoo that may be of interest:
https://www.sciencebuddies.org/science- ... t-performs
The aim of this project is to make your own shampoos and test several performance characteristics.
I hope this helps. Please ask again if you have more questions.
A. Norman