R.I. Gen. Laws § 23-27.3-109.1.3.5: Temporary greenhouse defined.

A temporary greenhouse means specialized agricultural equipment having a framework covered with demountable polyurethane materials or materials of polyurethane nature and lacking a permanent and continuous foundation, which is specifically designed, constructed and used for the culture and propagation of horticultural commodities. A temporary greenhouse may include, but is not limited to, the use of heating devices, water and electrical utilities, and supporting poles embedded in non-continuous concrete. A temporary greenhouse by this definition is a temporary structure. A temporary greenhouse shall be exempt from property taxes.