WHAT IS COMMUNITY SUPPORTED AGRICULTURE (CSA)?

CSA is a relationship of mutual support and commitment between local farmers and community members who pay the farmer an annual membership fee to cover the production costs of the farm. In turn, members receive a weekly share of the harvest during the local growing season. The arrangement guarantees the farmer financial support and enables many small- to moderate-scale organic family farms to remain in business. Ultimately, CSA creates "agriculture-supported communities" where members receive a wide variety of foods harvested at their peak of ripeness, flavor and vitamin and mineral content.
http://www.csacenter.org/movement.html.