In Mulberry Greenhouses, we know how much you love your plants. To keep them alive during winter season, we know that this can get really expensive. It might even outweigh the advantage of owning a greenhouse and growing your own plants. Here are some cheap ways to heat-up a greenhouse without using electricity; Decomposing hay or straw bales, dust bin or old oil drum filled with water, even a rabbit hutch complete with rabbit will warm it up......More information on this page.