That said, I do put a few houseplants outdoors in summer. A couple are just out there for decorative purposes, like my Norfolk Island Pine:
Others I put outside because, I admit, they are exceptions to my rules. A couple aren't well-suited to my indoor conditions, despite my best intentions, and need a rejuvenating vacation outdoors. There are also a couple of plants, which despite being okay with their places inside, are "problem" or ailing plants. For those, a bit of natural rainfall, fresh air and summertime humidity will usually turn them around.
Hedera helix, Fatsia japonica, and Dracaena reflexa 'Song of India.' The ivies and the Fatsia are outdoors because I think that fresh air and cooler night temperatures discourage spider mites. The Dracaena is just there because I like how it looks.
This Aspidistra elatior variegata was in the ailing plant category. I was perplexed by its failure to thrive, which I couldn't attribute to poor conditions or insects, so I put it under a tree and hoped for the best. It seems to be doing better.
In one of my earliest blog posts, I recounted the tale of "Foxy," my Asparagus myersii (Foxtail Fern.) Well, Foxy also spent the summer outdoors, in the hopes that it will continue to bounce back after its major pruning last fall. Maybe someday, it will regain its former size and beauty, and I'll have to start the process all over again.
Alpinia zerumbet variegata. I admit to abusing this poor plant this past winter, shoving it under lights in the basement, and frequently allowing it to get too dry. It has also recuperated nicely, and I've promised it a favored spot in a west window this winter, and plenty of water.
Tradescantia pallida, hanging around in my maple tree, just because. It was fine indoors, but I decided to put it out last month for its decorative value.
As autumn approaches, I will, of course, be bringing them back in. The Asparagus, Fatsia and Hedera helixes will stay out for quite some time yet, as they can handle a touch of frost. But when they do come in, I do not expect a dramatic decline from any of them.