According to a brochure Stonecrop Gardens on the Hudson River Valley Institute site:

The Conservatory at Stonecrop has four wings. Each wing has the ability to maintain a unique
environment with climate control systems. It was completed in 1997, and is used as a display house
in the winter and spring. At that time of year, the display house consists of non-hardy plants and various blooming bulbs, trees, and shrubs. In the summer, most of the plants are moved out into
the garden, so the Conservatory becomes a space for special projects. The heart of Stonecrop is The
Potting Shed, where visitors check in, pick up maps, pay the admission fee, begin their tour, and
have the opportunity to purchase some plants for themselves.