How do you grow a Hydra?

How would one embark on the process of cultivating a Hydra, the mythical multi-headed serpent? What are the necessary steps and conditions required to nurture such a fantastical creature? Is there a specific environment or diet that is essential for its growth and development? Are there any known challenges or obstacles that one might encounter in this endeavor? Furthermore, are there any legends or folklore that provide insights into the methods of nurturing a Hydra, or are we left to speculate and experiment based on our own understanding of biology and mythology?