A plant support is assembled from a plurality of interchangeable parts that can be readily assembled together to form a complete plant assembly having a desired size, in either an open or closed configuration, and to readily permit disassembly for storage or reconfiguration of the support. The plant support may be made up of various horizontal and vertical members that are configured to readily attach and detach from one another in order to form supports in various shapes and sizes such as enclosures or trellis-type supports.