The greenhouses are glass houses designed and constructed in the late 1960's by Lord & Burnham, who were important 20th century greenhouse builders. The greenhouses are the production facilities for the Horticultural Division, growing thousands of annuals, bulbs, poinsettia and other crops to be used at Cylburn, the Baltimore Conservatory and other city park sites.

Cylburn's greenhouses are not open to the general public, but visitors to Cylburn Market Day, held annually each May and other chosen sales, have the opportunity to buy overstock from the greenhouses on that day and to have a glimpse inside the buildings themseves. Tours for schools or garden clubs can be arranged through s the City of Baltimore Department of Recreation and Parks - Horticultural Division