ACRYLIC vs. Gel-Coat Fiberglass. Acrylic. One piece construction with dome. This adds strength to the unit and eliminates post installation. damage, no seams to caulk and gather mold and mildew, dome eliminates ceiling maintenance. Non porous surface, Easy to clean, no pores to catch soap, dirt, body oils.
In cold frame gardening, a cold frame is a simple structure that usually works like a mini-greenhouse. It has a wooden frame with a transparent roof made from glass and is always constructed low to the ground to provide proper insulation.
COLD ZONES: An important horticultural reference is the USDA Plant Hardiness Zone Map. The various zones indicate what the lowest winter temperature will most likely be be based on historical record keeping. It isn't foolproof but serves as a general guide for determining whether a plant will survive the winter in a given area. Other factors like micro-environments also influence survivability.