Catfucius says:
Plants in the northwest corner of the room create positive ch'i for the environment. This positive ch'i is maximized when the sagacious cat makes full use of the plant's energy by eating it.
Care should be taken not to eat too much of the plant. This can lead to excess energy. You must rid yourself of this excess. The wise cat waits until the dark hours of the morning and then politely deposits the bad ch'i where others will be sure to notice it -- for example, in a bedroom slipper or on a newly cleaned Persian carpet.