Answer: I apologize if you receive this answer twice. There is no set schedule to watering house plants. The frequency depends on the growing conditions in the room where it is kept, the size of the plant in relation to the size of the container, the type of potting mix it is growing in, and the plant's particular preferences.
Your Boston fern needs high humidity and soil that is kept evenly moist like a wrung out sponge. It should not be sopping wet/saturated and it should never dry out.
Your corn plant or Dracaena needs to dry slightly between thorough waterings, so water when the soil surface to top half inch is dry. It is sensitive to fluoride so you may want to water it with rain water or bottled water.
Use your finger to check the potting soil and see when you need to water.
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