The Limonaia, or Lemon House, creates the southern border of the Winter Garden. It was opened in late 2010. The Limonaia was designed by Centerbrook Architets and built by Cutler Construction. The cathedral-like interior of the cool-temperate Limonaia expands the display of non-hardy plants, augmenting those in the pre-existing Orangerie. Like the Orangerie plants, most of these go outdoors for the summer, so the Limonaia is primarily a winter display.
Traditionally, an orange or lemon house was built so the windowed south wall would allow sunlight to reach the back, or north, wall. This limited the depth of the building. The dimensions of the Limonaia reflect this tradition, although with its polycarbonate glazing overhead this was not strictly necessary. The polycarbonate provides the added benefit of retaining 50% more heat than standard glass.