The Grand Gardener Twin-wall Greenhouse Kit is made with a heavy-duty extruded resin frame for improved insulation and durability

or crack over time

keeping your entrance clear

Solid PVC structure

Riverstone | 16x30 ft Jefferson Premium Educational Greenhouse Package, 8mm Twin-wall Polycarbonate EDUCATIONAL GREENHOUSE The Grand Gardener Twin-wall GreenhouseDue to frequent cost fluctuation, please call for pricing. This is a custom made product and is non refundable or returnable once production has started. The Jefferson Greenhouse is named after our 3rd President who helped pioneer greenhouse growing and was the leading agriculturalist of his time. The Jefferson Educational Greenhouse Package is designed for schools with horticulture programs, correctional institutions, and serious gardeners for both