Field nurseries are the traditional method of producing and marketing ornamental trees, shrubs, fruit trees, and perennial flowers. Until the mid 1900s nearly all nursery crops were produced in the field. Even with the advent of aboveground container and pot-in-pot production, field nurseries are still widely used. Some of the advantages of field production over other production methods include: less maintenance and labor requirements during the growing period, ability of plants to overwinter in the field without additional protective measures, and lower start-up costs. In Kentucky, most field-grown trees and shrubs are sold as balled-and-burlapped (B&B), meaning that the soil surrounding the plant's root system is dug with the plant and wrapped in burlap.