projects » the conservatory of flowers In 1999 the San Francisco Conservatory of Flowers began a complete renovation of the landmark structure. Built in 1877 out of glass and old-growth redwood, the greenhouse was in dire need of repair. The trust undertaking the repairs, along with the City of San Francisco, chose to use TerraMai’s redwood, reclaimed from a lumber mill in Scotia, California, to replace aging pieces of the building. The project was successfully completed in 2003 and the conservatory is once again open to the public.