I don't have any. Plants tend to not live very long when I attempt to take care of them. I'm much better with animals.

On the whole "don't keep plants in your room at night" thing: it's true that at night they put out carbon dioxide. However, in most cases the amount is so very small, much smaller than the amount of oxygen plants release during the day, that there's really nothing to worry about. If there was, nothing would be able to survive in a planted terrarium overnight, and most people who keep reptiles and frogs in this manner can tell you how safe the setup is when done properly.

... See? I told you I was better with animals. Since your home is stuffed with plants, you probably already knew what I was talking about, anyway.

I have no plants in my house but I do have a huge garden.

I have too many cats. They eat any flowers that I put in a vase, so if I had other plants, they'd get eaten too.

I have none.