Perhaps if the cave was big enough. If a source of underground water is present, and enough light from a hole above, then many plants could grow within.

[ Which this one certainly is. He read about entire cave ecosystems that existed in the Old World. Though, this cave has the help of Teyvat's elemental energy density as well. ]

The electricity levels here are quite high... [ But it's something he can solve. Concentrating Geo energy in his hands, he conjures a crystal shield around them both. ] Watch your step.