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This BioStar 1500 Premium Cold Frame is a great alternative to a permanent greenhouse if space or complexities are a concern. The unusually thick panels are identical to those used in full sized greenhouses. These panels retain heat far better than glass and are stronger. If it's only an 8-9 month growing season that you care about and you want to clear some space for winter, this cold frame dismantles in five minutes for storage until next year.