While most of Golden Gate Park has been landscaped with lawns, flowerbeds and other ornamental features, a few remnants of San Francisco’s oak woodlands still exist in this world-renowned park. The northeast corner of Golden Gate Park is home to some of the oldest coast live oak trees in San Francisco.
A snapshot of the SFRPD Natural Areas Program staff and volunteers taking care of some of the oldest Coastal Live Oak trees in the city of San Francisco at the Oak Woodlands, an extraordinary remnant of native landscape in the northeast corner of Golden Gate Park. Come join the fun … Continue reading
[This photo shows a dead tree standing, one of the hazardous trees slated for removal] Pending approval by the Rec and Park Commission in September, we will begin the hazardous tree mitigation component of the Oak Woodlands Trails Improvement Project this Fall. The Trails Improvement Project is the result of … Continue reading
The Oak Woodland Trail Restoration project is moving forward. On September 15th the Recreation and Park Commission approved the Oak Woodland Trail concept plan that was developed with input from community members. The project will now begin the design development phase and is anticipated to begin construction in 2012. Oak Woodlands Trail concept … Continue reading
The Recreation and Park Department is hosting a series of community meetings to discuss future trail restoration improvements to the Oak Woodlands Trail in Golden Gate Park. Your input is important and will help us improve the Oak Woodlands Trail in a way that is most beneficial to the community. The meeting … Continue reading
Acorns, the fruit of oak trees, develop from the ovary of a single pollinated female flower. Oaks don't have showy, colorful blossoms like other flowering plants that rely on insects for pollination. Instead, pollen is carried by the wind from male to female flowers. Since the wind can be unpredictable and scatter pollen in many directions, oak flowers produce large amounts in order to maximize acorn production.
The oak's path from acorn to tree is a difficult one. In order to sprout, the acorn must escape predation from many animals. Gray squirrels and scrub jays are voracious predators and wide-ranging dispersers of acorns. Scrub jays may bury several thousand acorns in one season. By hiding, and sometimes forgetting about, their acorn caches, these animals are inadvertently "planting" future woodlands.
In order to sprout, acorns must either land or be hidden by animals in a place that is not too shady, hot, or dry. Good spots include layers of decomposing leaves and cracks in the soil at the edge of existing oak trees. From the time when the acorn germinates until it becomes a young tree, it is susceptible to drought and herbivory (browsing by deer, insects, and other animals). New leaves are especially tasty to animals, but if too many are removed, the tree cannot make its own food through photosynthesis and will starve. As a result, many plants have evolved to produce tannins and other chemicals distasteful to herbivores. Although some oak leaves are consumed by animals, the tannins discourage them from eating too many, allowing saplings to survive.
A world of ever-present creatures thrives among the shadows of an oak woodland. The acorn crop comes in the fall when other food sources dry up and many animals must put on fat for the winter. There are several species of birds known as sapsuckers that drink from the phloem (vascular tissue which transports sugars throughout the tree) just below the bark. Western harvest mice strip the bark and Botta's pocket gophers eat the roots of saplings. Insectivorous bird species such as brown creepers and nuthatches scour the trunks, branches, and leaves for the many insect species residing in oaks.
Oaks were essential to the survival of many Native American groups. An acorn mush or soup was a dietary staple to at least three-quarters of the California tribes, including the Ohlone people, who occupied what is now the San Francisco peninsula. The harvesting of acorns, which have great nutritional value, was done with ceremony and celebration. Acorn soup was cooked by placing acorn flour and water in a watertight basket with hot stones. In the Sacramento Valley, Native Californians made a dense acorn bread that kept for months.
Oak trees provided more than just food. Native Americans used the tannins to make a dye for decorating and softening animal skins and baskets and, in some tribes, for tattooing. The tannins were also used to treat a variety of ailments, from fevers to gastrointestinal problems. From the Native Americans, the European and Mexican settlers learned to use oak bark for tanning hides and oak charcoal to extract lime and make mortar, plaster, and fertilizer. Oak wood also made a fine fuel; few other trees provide the heat value of a cord of seasoned live oak.
Before European settlement, the area that is now Golden Gate Park was part of one of the largest inland-reaching sand dune systems along the western shore of North America. It stretched seven miles from Ocean Beach across the peninsula to the present-day Financial District. The western areas near the ocean were covered with constantly drifting sand. Toward the eastern end, rock outcrops and ridges provided a protected environment in which oak trees thrived. Despite their rich biological diversity and stark beauty, the dunes did not meet the European aesthetic for park land. In 1870, William Hammond Hall submitted a plan to Mayor Frank McCoppin to tame the sand dunes and "fit a graceful curvature" to the natural topography. Using horse manure, the park designers transformed the ever-shifting sand into stabilized, arable soil. The actual dune reclamation project began in 1872 with the planting of grasses, lupine, and various trees. The introduction of nitrogen-fixing species such as lupine allowed ornamental trees and shrubs to survive. Fortunately, the park was "built" around the oak woodlands, and today they remain a unique feature of Golden Gate Park and a historic remnant providing clues to an earlier ecosystem.
Golden Gate Park’s facilities and uses have changed throughout its history. The California Midwinter International Exposition, which lasted for six months and had over 2 million visitors, was held in the park in 1894. In 1906, thousands of refugees from the earthquake and fire took up residence in the park. The California Academy of Sciences moved to the park in 1910, and Kezar Stadium, the Beach Chalet, and the Steinhart Aquarium were among the facilities added in the 1920s and ‘30s.
Sand was transported from Sierra Nevada glaciers by rivers and debouched outside the Golden Gate, where strong onshore winds blew it across the northern tip of the city all the way to the Bay. Radiolarian chert outcroppings support a different biological community than the sand supported.
Coast live oak and toyon trees grew on the chert in small groves in an otherwise nearly treeless peninsula. Because these areas were already wooded, William Hammond Hall did not landscape them when he designed and landscaped Golden Gate Park, but left them as wild areas. He wanted the park to be “…an urban pastoral retreat, a semblance of nature.” The trees were cut down for fuel, especially during the homeless encampment after the 1906 earthquake, but they resprouted and the groves include trees which grew from these sprouts.
Three miles of asphalt and dirt paths wind through the Oak Woodlands and connect to the extensive trail and road network within Golden Gate Park. This part of Golden Gate Park can be accessed from The Conservancy of Flowers, JFK Blvd, Stanyan Street between Fulton Street and Fell street and also between and 6th Ave and Stanyan Street along Fulton. Parking is widely available around the park and throughout Golden Gate Park. Muni lines 5 and 33 stop along the park.