Answer: There is no set schedule, it will depend on the environment in the room where it is growing and on the potting mix and on the relative size of the plant vs. the container -- and it depends on what kind of soil moisture each plant prefers.
Boston fern (Nephrolepsis) does best in high humidity and with soil that is not allowed to dry out between waterings. Use your finger to check the soil and see if you need to water. It should be evenly moist meaning damp like a wrung out sponge, not sopping wet or saturated. Never let it dry out.
Corn plant (Dracaena fragrans Massangeana) soil should be allowed to dry at the surface to about a half inch down between thorough waterings. Again, use your finger to dig into the soil and see if you need to water. This plant is sensitive to fluoride so you may want to use rain water or bottled water for it.
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