The key to plant success is placment in an appropriate site. Outside, hostas perform best in some shade and daylilies prefer mostly sun. Houseplants are the same. The key difference is that the indoor “site” often refers to a particular window or exposure. Plants like ferns, begonias and African violets prefer indirect light, while cacti and succulents (aloe, jade, Old-man cactus, etc.) prefer direct light.