Over 30,000 species of orchids inhabit every corner of the planet except for the driest deserts and Antarctica. Humans have crossbred these species to create 140,000 hybrids, with more appearing all the time. Most are grown for their beautiful flowers, but the seedpods of the Vanilla orchid provide the popular flavoring. And unlike most plants, they do not grow in soil, but in the air. Their roots attach to trees or rocks where they capture moisture and nutrients that wash over them in the rainforest.