What is the stomatal density on the upper and lower epidermis of hibiscus and colacasia leaves?

I got a hibiscus plant which is beautiful. The leaves have lately been turning yellow. Why?

I have several house plants that thrive but now this hibiscus plant has the leaves turning yellow. Is there something that I can do or stop doing?
Answer:

It's getting ready to go to sleep! The leaves turn a nice yellow before falling off but don't worry, they'll be back next spring..

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