Conservatory of Flowers

Conservatory of Flowers
Golden Gate Park Conservatory
Location: San Francisco, California
Built: 1878
Architect: Lord & Burnham [1]
Architectural style: Italianate, Gothic[1]
Governing body: Local government
NRHP Reference#: 71000184 [1]
Added to NRHP: October 14, 1971

The Conservatory of Flowers is a greenhouse and botanical garden that houses a collection of rare and exotic plants in Golden Gate Park, San Francisco, California. With construction completed in 1878, it remains the oldest building in the park, and the oldest municipal wooden conservatory remaining in the United States. It is also one of the first municipal conservatories constructed in the country. For these distinctions and for its associated historical, architectural, and engineering merits, the Conservatory of Flowers is listed on the National Register of Historic Places, the California Register of Historical Places, is a California Historical Landmark, and a San Francisco Designated Landmark.


Architectural description

Front entrance of the Conservatory in 2006

The Conservatory of Flowers is an elaborate Victorian greenhouse with a central dome rising nearly 60 feet (18 m) high and arch-shaped wings extending from it for an overall length of 240 feet (73 m). It sits atop a gentle slope overlooking Conservatory Valley. The structural members are articulated through one predominant form, a four-centered or Tudor arch.

The Conservatory of Flowers consists of a wood structural skeleton with glass walls set on a raised masonry foundation. The entire structure has a shallow E-shaped plan that is oriented along an east-west axis. The central 60-foot (18 m) high pavilion is entered through a one-story, glassed-in vestibule with a gable roof on the south side of the pavilion. Flanking the rotunda to the east and west are one-story, symmetrical wings framed by wood arches. Each wing is L-shaped in plan, with cupolas adorning the intersection of the two segments.

The octagonal pavilion supports an arched roof that is, in turn, surmounted by a clerestory and dome. The clerestory is supported by eight, free-standing, wood-clad, cast iron columns located within the rotunda and grouped in pairs. Projecting from the pavilion roof on the east, west, and south elevations are dormer windows with peak roofs. Between major arched structural framing members are wood muntins that hold the glass lights on their sides. The lights are lapped one over one another like shingles and follow the curve of the arches.

The construction of each arch is aesthetically appealing in its simplicity, but also structurally clever in that it takes maximum advantage of wood as a building material while overcoming its inherent structural shortcomings. From a structural perspective, the arch design utilizes the mechanical properties of the material. Wood is strongest along the length of the grain and weakest along the end grain. The use of short arch components with shallow radii minimized the amount of weaker end grain exposed to structural forces. The assembly of the arch with several small pieces of wood, the shapes of which are identical from arch to arch, is efficient. It allowed the fabricator to set the machines with guides and templates so that cutting the multiple-arch components was a simple task. Furthermore, the design required little material since each individual arch component has only a shallow radius. Moreover, by using relatively narrow widths of lumber, the chance of warping was minimized. Finally, there was an efficiency realized in transportation, as the small size of the arch components allowed them to be easily stored and shipped.

The structural wood arches and their method of construction, along with the decorative woodwork and unique lapped glazing, define the character of the Conservatory of Flowers. The major character-defining elements associated with the Conservatory of Flowers consist of ornamental and structural woodwork, including the method of fabrication used for the arches, the lapped glazing system, the ventilation system, and the building’s siting and exterior landscaping.[2]


The Conservatory kit was bought by James Lick, an eccentric businessman, piano maker, and successful real estate investor. It was intended for the City of San Jose where Lick had built a mansion surrounded by exotic plants imported from South America and around the world. Lick died in 1876 before constructing the conservatory on his estate, and it was put up for sale by his trustees. The kit was then purchased by a group of prominent San Franciscans, including Leland Stanford and Charles Crocker, who offered it as a gift to the City of San Francisco for use in Golden Gate Park. The Parks Commission accepted the gift and hired Lord & Burnham, a greenhouse manufacturing company from New York, to supervise the erection of the structure. Once open, it contained a large variety of rare and tropical plants, including a giant water lily, Victoria Regia, which at the time was the only known specimen in the United States.[3]

Historic context

In both Europe and America, the 19th century brought increased urbanization and industrialization. In response, city governments began providing city-dwellers with open spaces and natural settings for public use.[4] The profession of Landscape Architecture expanded during the later part of the 19th century, and park design became a large part of this new profession’s repertoire. In addition, a significant outgrowth of the need for natural surroundings in urban contexts was an increase in the study of plant sciences during this period, both by professionals and amateurs. A building type called the glasshouse or conservatory took shape in which the city-dweller could view masterpieces of the plant world otherwise unavailable in urban environments. Municipalities and individuals spent a great deal of time and money to construct these building types that became known as “theaters of nature.”

The Kew Gardens palm house has been described as the inspiration for the Conservatory of Flowers.

Similar conservatories were constructed across Europe, starting in the early 19th century. Perhaps the most well known of these is the Palm House in the Royal Botanic Gardens, Kew in London. These structures were enjoyed by a broad cross-section of the public. Following European fashions, wealthy Americans began to construct conservatories in the mid-19th century on private estates. James Lick, a wealthy Californian, purchased a conservatory for his Santa Clara Valley estate but died before it could be erected.

Historic material developments

The 19th century glasshouse grew out of the city-dweller’s desire to bring nature and the natural into urban life.[5] These structures became popular in urban, public, and semi-public settings. As these structures gained popularity in Europe, greenhouses began to be constructed on larger scales and of stronger materials. One engineer, Joseph Paxton (1803–1865), had an enormous effect on the development of the conservatory building type. His structures called for a system of glass and metal roof construction, whereas past structures had typically been constructed of wood and glass. His choice of materials allowed designs for glasshouses which were of substantially larger scales. His most well known example is The Crystal Palace at the world’s first International Exhibition in 1851. Elsewhere in Europe, Hector Horeau designed several conservatories of glass and iron, such as the Lyons Conservatory in France of 1847. In Germany, August von Voit designed Great Palm House in Munich in 1860.

The engineering behind The Crystal Palace allowed much larger greenhouses to be constructed.

The increased use of glass and iron as building materials also impacted the development of the glasshouse. The decades following the debut of the Crystal Palace saw a decline in the use of wood structural members for the construction of large European greenhouses or conservatories. Many manufacturers had found that the humid heat necessary to successfully propagate numerous plant varieties often destroyed wood structural members in short periods of time.[6]

Historic material use in California

Conservatories were popular throughout California’s early history. Structures of various shapes and sizes were built in Victorian California, ranging from an attached and glassed-in wing for a residence, to a great domed or compartmentalized, detached glasshouse.[7] Examples of wealthy Californians who built conservatories in their private estates include: A.K.P. Harmon, for his Oakland Lake Merrit Estate (which later became Lakeside Park); Frederick Delger; Frank M. Smith; Darius Ogden Mills (Millbrae); and Luther Burbank, for his own experiments with plant germination (Santa Rosa). This is not surprising, as agriculture was fast becoming an important part of the state’s economy and horticulture an important aspect of the gentleman’s education. In each of these cases, wood was substituted for metal as the framing members. This poses special challenges for the ongoing maintenance and repair of the greenhouses in the long term.[8]

Wood v. iron

Why did James Lick have his conservatory constructed of wood rather than iron, as was common in the later part of the 19th-century? The fact that wood was plentiful in the west is a strong reason that the Conservatory of Flowers was constructed of this material. Cast iron greenhouses do not appear to have been widely manufactured in America until the 1880s.

Other known American wood conservatories of this period included Lyndhurst in Tarrytown, New York. The Lyndhurst Conservatory, constructed in 1869 of wood by the estate’s first owner George Merritt, was destroyed by fire in 1880. The estate’s second owner, Jay Gould, rebuilt the conservatory in 1881, hiring the firm of Lord & Burnham to manufacture his greenhouse. The 1881 Lord & Burnham structure was composed primarily of cast iron and glass. The Gould Conservatory at Lyndhurst is credited with being the first conservatory of iron in the United States and with inspiring subsequent structures of the same material. After their success with the Gould Conservatory of 1881, Lord & Burnham and other conservatory manufacturers apparently produced few large conservatories of wood.[9]

Lord & Burnham and other manufactures of conservatories found that the humid heat necessary to successfully propagate numerous plant varieties often destroyed wood structural members in short periods of time.[10]

Conservatory origins

There are many theories regarding the origin of the Conservatory of Flowers. It is widely believed that the building was fabricated in England and shipped around Cape Horn to California. However, different sources have stated that it originated in England, France, or Ireland, but no primary records have confirmed these statements. Materials analysis suggests that the structural wooden members were constructed of regional redwood.[11]

Controversy over material source

Despite its prominence as a San Francisco Landmark, no primary source has been found that clearly identifies the origin of the Conservatory of Flowers. Contributing to the confusion is erroneous information, based upon misunderstanding of the building or a cursory review of historic documentation that has appeared in print.

The crux of the issue is that some historic documentation infers that the building was imported. Since it was common for conservatories to be shipped far from the place of manufacture, one could be led to conclude that this was the case with the Conservatory of Flowers. However, there is no historic information to substantiate the importation of the structure. Materials analysis indicates that the original structural components of the building were fabricated from indigenous California Coast Redwood.

Assessment of California manufacture

Despite a range of published information to the contrary, physical evidence suggests that the Conservatory of Flowers was constructed originally of redwood and milled on the West Coast. This hypothesis is supported by the historical data concerning California manufacturing capabilities during the 1870s. This data indicates that other buildings of equal complexity were being manufactured from redwood during this period.

As part of the architectural investigation conducted by Architectural Resources Group in 1998, wood samples were taken from various locations throughout the building, and the majority found were coastal redwood (Sequoia sempervirens). The samples that were not redwood came from window sash and areas of the building known to have been repaired previously with Douglas Fir. In addition, through visual inspection, it was determined that there was a significant amount of redwood in the building despite the various repair campaigns that have occurred throughout the years.


No primary document has been uncovered to indicate the architect of the Conservatory of Flowers. It is possible that the plans uncovered at Lick’s estate were produced by Lord & Burnham, the major manufacturer of greenhouses at the time. The Conservatory of Flowers bears resemblance to many of Lord & Burnham’s other contemporary structures, one of which was purchased by D.O. Mills, a trustee of James Lick, in 1872. Numerous printed articles described the conservatory as “modeled after those in the Kew Gardens, London.”

The San Francisco Public Library also holds a document entitled Information about Samuel Charles Bugbee, written by a relative, Arthur S. Bugbee in 1957. It indicates that the architect, Samual Charles Bugbee, whose works included the homes of Leland Stanford and Charles Crocker and the Mendocino Presbyterian Church, also included the Conservatory of Flowers. Unfortunately there are no primary source materials that have been uncovered that confirm Bugbee’s involvement in the design process.

Lord & Burnham

There is direct evidence that the New York firm of Lord & Burnham was contracted by the Park Commissioners to construct the Conservatory of Flowers in Golden Gate Park. Although Lord & Burnham supervised construction of the Conservatory of Flowers in Golden Gate Park, no primary evidence has been found to suggest or confirm their involvement in the manufacture of the building.

Construction of the Conservatory of Flowers

The Conservatory of Flowers was an indirect gift of philanthropist James Lick. There is little surviving evidence that details the construction of the Conservatory of Flowers. Records indicate the construction costs were roughly $30,000.[12]

Construction statistics

The conservatory has 16,800 window panes. The upper dome of the conservatory weighs 14.5 tonnes.

Langley’s San Francisco Directory for the Year Commencing April 1879 discussed the construction of the Conservatory of Flowers:

The whole building required in its construction twenty-six thousand square feet of glass weighing twenty-five tons, and two tones of putty. It is a marvel of architectural beauty, surpassing in this respect any similar construction in the United States, and is only equaled in size by the Government Conservatory of in the Horticultural Gardens at Washington.[13]

Repair campaigns

The Conservatory, as it appeared in 1879, before its dome was replaced following the 1883 fire.

Through its life, the Conservatory of Flowers has undergone several repair campaigns. The Palm Room, located in the center of the building, was seriously damaged in a fire in 1883. Its dome was completely reconstructed at this time. It sustained little damage following the 1906 earthquake. After a second fire damaged the structure in 1918, repairs were made as needed but were not thoroughly documented. No significant documented repairs to the building took place again until sometime after World War II when certain portions of the wood work, including structural elements, were replaced. In 1959, wood windows at the base of the glazed walls at the building’s perimeter were infilled with concrete panels which were cast to match the profiles of the original construction. In 1964-65, the clerestory of the Palm Room underwent reconstruction. The columns, lintels, and sills in this area were replaced by pressure-treated redwood. Five hundred lineal feet of the exterior cap molding, which covers the arches, was replaced at this time as well. Between 1978 and 1982, major repairs were performed on deteriorated woodwork. The areas that were repaired during this time did not overlap the 1960s repairs to the clerestory.

In general, it appears that after 1914 most maintenance work was undertaken only when conditions presented a safety hazard, mechanical systems were in need of repair, or the building became extremely unsightly. Lack of scheduled maintenance adversely affects the performance of building materials. Wood, in particular, requires proper maintenance of paint coatings to control the development of rot. In this building it is important to maintain the condition of the interior, as well as exterior, coatings because of the humid indoor environment. Also necessary is the maintenance of waterproofing details, such as flashing, to prevent water from accumulating in concealed areas. It is therefore not surprising that rot developed in the building and significant repairs to the wood elements of the building were necessary over time, given its somewhat irregular maintenance history.[14]

Early years

In the first years after the Conservatory was constructed, ongoing maintenance was necessary for both the structure and its collection. This included repairing the boilers in the furnace room, the installation of ventilators, and the installation of a cement floor. At this point the Conservatory held over 9,000 plants of various kinds.[15]

1883 fire

The Conservatory in 1897.

In January 1883, the Conservatory caught fire, with the main dome sustaining the heaviest damage. Evidence suggests the fire started as the result of intense heat generated by the furnace. Charles Crocker donated $10,000 toward the repair fund. The reconstructed dome included the addition of a clerestory. The original dome was saucer-shaped, while the replacement dome was more classically domical in its appearance. The other major change was the finial, which prior to the fire consisted of an eagle figure, whereas the replacement feature is a traditional turned finial of wood. This has been the only major change in the overall form of the building during its lifetime.

The remainder of the nineteenth century

Records indicate ongoing maintenance included painting in 1887-1889 and saw repainting again in 1890. In 1894, the Conservatory’s surrounding landscaping saw numerous transformations in preparations for the 1894 California Midwinter International Exposition. The Conservatory again was repainted in 1899 and received new floors of grooved concrete. At this point, the old floors, some of wood and some of concrete, were replaced by new grooved concrete. The grooves in the floor were intended to carry off the surplus water and make a visit to the Conservatory more comfortable and pleasant. Several wooden plant benches that had rotted out were replaced by benches made of concrete wire netting and will stand the constant change of temperature better than wood.

The Conservatory, one month after the 1906 San Francisco Earthquake.

The 1906 earthquake

The San Francisco earthquake and fire of 1906 appear to have done little damage to the Conservatory of Flowers. The structure is visible in a number of photographs of refugees living in Golden Gate Park after the disaster. However, records indicate that reconstruction costs ensued to the surrounding landscape from refugees living in the park.

Early twentieth-century repairs

Minor repairs were made to the Conservatory of Flowers in 1912 and 1913, including carpentry, cement setting for plant benches, and other small repairs. In 1918 a fire, commencing in the furnace room, caused damage to the Conservatory’s Potting Room and adjacent Dome Room. Repairs were made as needed.

Depression Era decline

During the Depression, the Conservatory of Flowers, due to apparent lack of maintenance, was in poor condition. It appears that little was done to rectify the dire circumstances of the building. The Park Commissioners instructed the Superintendent of Parks to close the Conservatory of Flowers in 1933 and construct proper barricades to prevent possible injury to citizens. The wood-work, foundations, girders, posts and various structural members of became rotted and decayed to such an extent that certain portions of the conservatory were reported to be in danger of falling and potentially causing great injury.

Post-War era

In August 1946, the Conservatory of Flowers was painted and re-glazed. A new electrical system, which allowed automatic control of the heating system for all of the Conservatory, was installed in 1948. New piping was installed in 1949. A new water supply was installed in 1956.

In 1959, the original doors at the wing entrances were replaced with plate glass windows and concrete panels. That same year, the lower ventilators at the building’s perimeter were removed, and concrete panels, cast in the profile of the ventilators, were installed. This unfortunately seriously compromised the building’s natural ventilation system. A few minor repairs were made in 1962 and 1965.

A major rehabilitation project took place between 1978 and 1981. Work included the removal of all interior and exterior caps of the arches for visual inspection and probing, in order to detect pockets of wood rot. The portions of arches showing surface wood rot were treated with ‘Git-Rot’, a wood preservative. The caps that remained in good condition were salvaged and reinstalled.

Building evidence suggests that the exterior surfaces of the arches were originally fitted with copper flashing. The flashing was secured onto the arches and covered by the wood caps. In most locations that were inspected the flashing had been removed, leaving only short remnants at random locations. The flashing was rolled up and taken away during the 1982 restoration effort. The flashing was an effective method of preventing moisture from entering the joints in the arch assembly, and its removal hastened deterioration. During this restoration as well, various deteriorated wood elements were replaced with pressure-treated, glue-laminated members.

Millennium rehabilitation

During the winter of 1995-1996, a series of large storms exacerbated the ongoing deterioration of the wood structure. The 100-mph winds blew out 30,000 fogged white glass panes in the Conservatory, shattered the white, glass dome, and weakened the structure. In addition fifteen percent of the plant collection was lost due to exposure to the cold, wintry air, and flying glass. After covering the holes with tarp and plywood and bringing in some heaters, the Conservatory contemplated farming out hundreds of plants to other institutions while the building was repaired. Some specimens however were too big or too old to move. The most challenging plant was the one hundred twelve year old Brazilian philodendron that inhabited the shattered dome. A greenhouse was built to house the philodendron and other plants during renovation and afterwards used for expansion and keeping more exotic plants.

The conservatory was placed on the 1996 World Monuments Watch by the World Monuments Fund. The Fund aimed to encourage repair rather replacement of the original fabric, and provided funding from financial services company American Express.[16] In 1998, the National Trust for Historic Preservation adopted the Conservatory into its Save America's Treasures program, launched as part of First Lady Hillary Clinton's Millennium Council projects. The publicity from these efforts eventually led to a fundraising campaign to raise the twenty-five million dollars needed for rehabilitation, restoration, and stabilization of the Conservatory. The construction lasted from 1999 until 2003. On September 20, 2003, the restored Conservatory was once again opened to the public.

Repair methodology

Between November 1996 and January 1997, on-site surveys were conducted by a project team consisting of Tennebaum-Manheim Engineers and Architectural Resources Group. Surveyors included architects, materials conservators, architectural historians, structural engineers, mechanical engineers, and electrical engineers. The architectural and materials condition survey included a close-range visual inspection of all of the wood members in the building to determine locations of deteriorated wood, an analysis of the types of wood species occurring in the building, a study of the building’s construction details, glazing, and a photographic survey. The structural survey included measuring the deflection of each of the arches and studying the probable lateral and vertical load paths to determine areas of weakness.[17]

Survey findings

The deterioration of wood occurred at typically vulnerable areas, such as the exposed end grain of arches and muntins and where wood members intersect. The humidity in the building was contributing factor to wood deterioration. The level of moisture in the building was exacerbated by two conditions. First, the building’s natural ventilation system had been removed in a past repair. The ventilators which were originally located in the low wall area had been filled in, and some of the ridge ventilators were inoperable. The air flow through the ventilators, which would have assisted in the evaporation of water, was not occurring. Second, the penetration of rain water from the exterior of the building, because of inadequate or deteriorated water-proofing, had increased the level of moisture in the wood. The copper sheathing that had originally capped the arch exteriors may have been, in addition to acting as a moisture barrier, acting as a biocide through copper oxides inhibiting wood rot.[8]

Repair process

The Aquatic Plants room with flowing water, carnivorous plants, and some giant Victoria lilies.

Due to the level of deterioration and concerns relating to the building’s long term maintenance, a scheme was used to restore the wood structure. This involved disassembling the structure, repairing salvageable materials, and replacing materials deteriorated beyond repair with old-growth redwood that had fallen naturally or had been left behind by loggers. This was possible due to the original method used to fabricate the structure.

The construction sequence was as follows. First, temporary protection for those plants that could not be moved was provided. Then, the glass was carefully removed from the building, and historic glazing was salvaged. Structural wood elements of the building (arches) as well as muntins that held the glazing were disassembled. The location of each element was recorded for reinstallation. The lead-based coatings were stripped from the wood members. Each wooden piece was then tested for its strength and determined if repair or replacement was appropriate.


Today the conservatory contains approximately 1,700 plant species. Its collection of high-altitude orchids - more than 700 of the 1,000 known species - is described as the largest and most comprehensive public collection in the world. Representative plants from its collections include:

In May 2005, a corpse flower species Amorphophallus titanum bloomed, attracting more than 16,000 visitors. The Conservatory also welcomed its 500,000th visitor since reopening. The special exhibit of Summer '08 is called "The Butterfly Zone," showcasing a dazzling array of more than 25 species of colorful butterflies, as well as Night Safaris that let you search with flashlights for nocturnal moths.

See also


  1. ^ a b c "National Register of Historic Places - California (CA), San Francisco County". National Register of Historic Places. National Park Service. Tuesday, 20 July 2010. Retrieved 2 September 2010. 
  2. ^ An extensive architectural description and building history is located in the Conservatory of Flowers Complex in Golden Gate Park: Historic Structures Report, prepared for the Recreation and Park Department of San Francisco by Architectural Resources Group in 1998. The project historian was M. Bridget Maley, MA, and the principal-in-charge was Bruce Judd, FAIA.
  3. ^ San Francisco Examiner. “A Giant Flower.” July 10, 1879
  4. ^ Several studies have been undertaken concerning the development of the urban park in America including John Reps, The Making of Urban America, 1965; David Schuyler, The New Urban Landscape: The Redefinition of City Form in Nineteenth Century America; and Galen Cranz, The Politics of Park Design, 1982.
  5. ^ The most extensive study of the glasshouse building type is Georg Kohlmaier and Barna von Sartory, Houses of Glass, 1996, which focuses primarily on European structures. A second source that discusses American structures is May Woods and Arete Swartz Warren, Glass Houses: A History of Greenhouses, Orangeries and Conservatories, 1988.
  6. ^ Georg Kohlmaier and Barna von Sartory’s Houses of Glass, 1996
  7. ^ Richey, Elinor. The Ultimate Victorians of the Continental Side of San Francisco Bay. 1970.
  8. ^ a b David Wessel and James Cocks, "Repairing Victorian Wooden Greenhouses of the West Coast," presented at the annual meeting at the American Institute for Conservation in 2007.
  9. ^ Britz, Billie Sherrill. "The Greehouse at Lyndhurst", National Trust for Historic Preservation. Research on Historical Properties Occasional Papers Number 1, 1977.
  10. ^ Goerg Kohlmaier and Barna von Sartory, Houses of Glass, 1996.
  11. ^ Detailed historical analysis, incorporating extensive research incorporating primary documents, historic context, and materials testing, was performed and described in Conservatory of Flowers Complex in Golden Gate Park: Historic Structures Report, by Architectural Resources Group, in 1998.
  12. ^ San Francisco Municipal Reports, June 30, 1879
  13. ^ Langley’s Directory. 1879: 28.
  14. ^ A detailed list of documented repairs, along with their analyses are located in Conservatory of Flowers Complex in Golden Gate Park: Historic Structures Report, by Architectural Resources Group, 1998.
  15. ^ San Francisco Municipal Reports. 1881-1882, 244.
  16. ^ World Monuments Fund - Golden Gate Park Conservatory of Flowers
  17. ^ Conservatory of Flowers Complex in Golden Gate Park: Historic Structures Report, by Architectural Resources Group, 1998, page 95. The project conservator was David P. Wessel, AIC

External links

Coordinates: 37°46′19″N 122°27′36″W / 37.772°N 122.460°W / 37.772; -122.460

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