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This area of the greenhouse does not use any type of heating system, thus the name “The Cold House”. Most greenhouses have a glass dome to create a more heated environment for exotic plant species, but this area of the Lisbon Greenhouse only has a lath roof. This type of roof helps to protect more hardy plants from the excessive cold of winter and the strong heat of the summer sun, but they do not need such controlled temperatures as hothouse plants and the protection offered by the lath roof is more than adequate for the type of plants grown here. These plants come from such countries as China, Australia, Mexico, Peru, Brazil, the Antilles and also from the region of the Korean Peninsula. The most important plants in the collection are the Tasmanian fern [Dicksonia antarctica], the azalea [Rhododendron spp.] and the different types of camellias [Camellia japonica].