Companion plantings of some kind have been practiced throughout agricultural history. Some of the earliest written documents on gardening discuss these relationships. Early settlers discovered American First Nations people were using an interplanting scheme of corn-bean-squash that balanced the requirements of each crop for light, water, and nutrients. In the 1800’s, hemp (cannabis) was often planted around a cabbage field to keep away the white cabbage butterflies in Holland. In many parts of the world today, subsistence farmers and organic gardeners grow two or more crops simultaneously in a given area to achieve a certain benefit.