Alton Evolution Octagonal Cedar GreenhouseAlton Evolution Octagonal Cedar Greenhouse This stylish Octagonal model from Alton brings a touch of modern elegance to your garden, as well as horticultural practicality. Made from the same warm hued western red cedar as the rest of the Evolution range, with the same rot resistant properties, this spacious high eaves model provides the perfect growing environment. With its 2 high level side louvre vents and 2 automatic roof vents (which open and