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Plant quarantine is a technique for ensuring disease- and pest-free plants, whereby a plant is isolated while tests are performed to detect the presence of a problem.

In the U.S., the Animal and Plant Health Inspection Service (APHIS) retains the plant quarantine function, although the agency’s border-inspection function was transferred to the Department of Homeland Security (DHS) by P.L. 107-296.^{[citation needed]}

•  This article incorporates public domain material from Jasper Womach. Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition (PDF). Congressional Research Service.