In agriculture, multiple cropping is the practice of growing two or more crops simultaneously in the same space during a single growing season. It is a form of polyculture. A related practice, companion planting, is sometimes used in gardening and intensive cultivation of vegetables and fruits. One example of multi-cropping is tomatoes + onions + marigold; the marigolds repel some of tomato's pests. One kind of multiple cropping is intercropping, where an additional crop is planted in the spaces available between the main crop.