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 hardiness zones divide regions into zones based on minimum winter temperatures. The higher the number, the warmer the zone. Your trees and shrubs should be cold hardy in your climate -- which means they are able to withstand the lowest winter temperatures likely to occur in your climate. Otherwise they may freeze to death and leave an unwanted hole in your landscape.