The Limonaia, or Lemon House, opened in 2010. The cathedral-like interior reflects the architecture of a traditional lemon house, with a windowed south wall for optimal winter light, augmented with overhead glazing to admit more light. The Limonaia displays a portion of Tower Hill’s collection of non-hardy plants that need to winter in a sub-tropical environment. Though daytime temperatures might reach as high as 70°F, night time temperatures can dip as low as 45°F. The plants displayed in the Limonaia are chosen for their winter grandeur with enticing fruit, flowers or outstanding foliage and fragrance.