bedding plant, any of a number of plants that are grown, usually in quantity, in pots or flats in a greenhouse or similar structure and that are intended to be transplanted to a flower garden, hanging basket, window box, or other outdoor planter. Most bedding plants are annuals. They are transplanted outdoors after all danger of frost has passed and are often massed together for a visual impact. Some important bedding plants are impatiens, marigolds, ageratum, pansies, and petunias.