Moth orchids, Phalaenopsis, are epiphytic plants meaning that in the wild they grow on the surface of other plants, rather than in the soil. They bear delightful, pink, white or purple flowers. Phalaenopsis should be grown in a special bark medium rather than compost, and require a humid atmosphere and bright, filtered light to thrive. They tend to perform best when grown in light, humid kitchens and bathrooms.