Promote Harmony with Houseplants:

Houseplants generate vital energy by exhaling oxygen into the air. The wood element represents spring, new beginnings, growth and wealth, therefore it is important to place houseplants in every room. Colorful flowers bring even a greater balance in your life. Feng Shui is to bring happiness, harmony, good luck and money into your home. In the bedroom, generate energy for resting and romance by using plants with round, soft leaves. If you want to attract wealth, use plants with round edges, like jade which signifies wealth. Offices contain much yang energy due to the electrical equipments and hard surfaces. Fill your office with soft plants to generate more energy. Avoid plants with sharp, pointy leaves or thorns including cactus and spider plants because they emitnegative energy. Choose plants that are healthy and vigorous. Throw out diseased or dying plants, as they give out Shar chi­ (negative energy). House plants promote business growth and brighten any work space.
Source: http://www.ganeshaspeaks.com/blog_Feng_Shui_Makeover_Part1_1145.jsp