Orchid leaves turning yellow isn’t uncommon ... including Odontoglossum, Cymbidium, and Dendrobium. Most types of orchids like some humidity, but they’re also prone to growing bacteria ...

Stems that have turned yellow or brown should be cut off ... Phalaenopsis (moth) orchids, Psychopsis (butterfly) orchids, and some Dendrobium orchids potentially rebloom. These orchids bloom ...