Spider Plant
Spider plants are the gift that keeps on giving. As long as you place it in a fairly well-lit room, this little piece of greenery will remove impurities like formaldehyde and carbon monoxide from the air in the moist environment. Plus it will also continually sprout new buds that you can re-pot or give away. Just make sure to water once or twice a week and place it in front of your bathroom window if it receives medium light throughout the day. If the window is continually bathed in sunlight (lucky you!), simply place just out of direct sunlight.
Orchids
Orchids, though they can be a tad bit temperamental, are so worth the extra effort to grow in your bathroom; after all, they keep their gorgeous flowers for months on end. The damp, warm conditions in most bathrooms are a perfect environment for these pretty plants, which grow in bark instead of soil and prefer for that material to be damp but not wet. Some easier-care varieties of orchids include Dendrobium, Phalaenopsis, and Paphiopedilums, which will all do well with bright, filtered bathroom window light.
Gardenia
The gardenias most often grown as indoor plants are G. jasminoides, also known as cape jasmine. These tropical broadleaf evergreens are not particularly easy to grow indoors, since they respond poorly to cold drafts or sudden blasts of heat, but they can work well in the humid conditions of a bathroom, provided they get enough bright light. These can be large plants, growing to 6 feet, but can be kept smaller with frequent pruning. Feed with an acid fertlizer.
Peace Lily
Peace lilies are elegant plants that require minimal care. They do best with regular watering and appreciate the humidity in the bathroom. Do not allow the soil to remain dry for extended periods of time. Peace lilies do well in limited light; however, if your plant is not flowering, it may need a slightly brighter location. When feeding, use a very diluted fertilizer mix.
China Doll Plant
A dark green China doll plant (Radermachera sinica) is perfect for sliding into a bathroom corner near a window. China doll plants need bright, indirect sunlight and moist, well-drained soil, and must be protected from drafts. Since they like the heat and moist conditions, they'll thrive in the warmth of your bathroom.
Peperomia
This small-growing, low-light-loving plant comes in a variety of colors and adorable leaf shapes. Its compact size makes it perfect for tight quarters, such as narrow shelves or terrariums (but it doesn't like direct sun, so keep it away from the windowsill). This particular striped variety is watermelon peperomia, or Peperomia argyreia. Peperomia is super easy to care for, loves humidity, and only needs watering when the top of the soil feels dry.
Bamboo
Lucky bamboo is a natural oddity. Typically speaking, bamboo grows in water and is a super low-maintenance pick that will also give your bathroom some serious spa vibes. It's a great plant for low-light spaces, so if your bathroom doesn't get a lot of sun, don't worry—bamboo will still grow successfully there.
Dracaena
There are several types of dracaena to choose from (the lemon lime variety is a fun, striped option!), and they make great bathroom plants as well. For this plant, high humidity is key, so your bathroom is basically the perfect location for it. They will also tolerate low light, but will do even better in a medium to bright indirect light location.
