Answer: I'd move the houseplants outdoors as soon as the outdoor temperatures are about the same as the plants have experienced indoors. I take my plants out when nighttime temperatures remain above 55F. To begin with, take them out during mild afternoons but bring them back indoors overnight. After about a week of this gradual conditioning you can leave them out overnight (providing the temperature remains above 55F).
Some ferns and palms, as well as Mother-in-Law's tongue will thrive under low-light conditions.
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